1,I am moving in to our new house tomorow→she said 2,why don't we discuss this problem at the next club meeting→he sugessted that 3,we keep information on our computer→the 4,he spent three hours go...

1,I am moving in to our new house tomorow→she said that she was moving into her new house the next day 2,why don't we discuss this problem at the next club meeting→he sugessted that we should discuss that problem at the next club meeting 3,we keep information on our computer→the information is kept on our computer 4,he spent three hours going to lao cai→it took him three hours to go to Lao Cai 5,no one in mai s'family is as tall as mai→mai is the tallest in her family 6,the town was beautiful.we spent our holiday there last summer→the town where we spent our holiday last summer was beautiful 7,to do exercise is interesting→it is interesting to do exercise 8,i'm certainly not going to help you→i have no intention of helping you 9,she can speak russian much better than i do→i can't speak Russian as well as she 10,john advised me to spend more time on the next exam→johnn suggested that I should spend more time on the next examCâu trả lời: 1,I am moving in to our new house tomorow→she said that she was moving into her new house the next day 2,why don't we discuss this problem at the next club meeting→he sugessted that we should discuss that problem at the next club meeting 3,we keep information on our computer→the information is kept on our computer 4,he spent three hours going to lao cai→it took him three hours to go to Lao Cai 5,no one in mai s'family is as tall as mai→mai is the tallest in her family 6,the town was beautiful.we spent our holiday there last summer→the town where we spent our holiday last summer was beautiful 7,to do exercise is interesting→it is interesting to do exercise 8,i'm certainly not going to help you→i have no intention of helping you 9,she can speak russian much better than i do→i can't speak Russian as well as she 10,john advised me to spend more time on the next exam→johnn suggested that I should spend more time on the next exam

1,I am moving in to our new house tomorow→she said 2,why don't we discuss this problem at the next club meeting→he suge...

Hãy tham gia nhóm Học sinh Hoc24OLM

JM

Jang Min

22 tháng 11 2018 lúc 18:25

Exercise 1: Rerwite the following sentences that keep the same meaning. 1. This is the fastest way to get to the city center. There .................................................................................................................................................................................... 2. If anyone succeeds in solving the problems, it will probably be him. He is the most ...................................................................................................

Đọc tiếp

Exercise 1: Rerwite the following sentences that keep the same meaning.

1. This is the fastest way to get to the city center.

There ....................................................................................................................................................................................

2. If anyone succeeds in solving the problems, it will probably be him.

He is the most ..................................................................................................................................................................

3. We arrived too late to see the first film.

We didn't ............................................................................................................................................................................

4. "Would you mind not smoking in here?"

I'd rather ...............................................................................................................................................................................

5. He wrote the letter in two hours.

It took .....................................................................................................................................................................................

6. "Why don't we go out for a walk?"

My father suggested ............................................................................................................................................................

7. In spite of his age, Mr. Benson runs 8 miles before breakfast.

Though .................................................................................................................................................................................

8. I was very interested in our conversation.

It was interesting ......................................................................................................................................................

9. Why did you do that ?

Whatever .......................................................................................................................................................................?

10. These bookshelves are my own work.

I made ...............................................................................................................................................................................

Exercise 2: Rerwite the following sentences that keep the same meaning.

1. I don't play tennis as well as you do.

You .....................................................................................................................................................

2. I haven't been to the dentist's for two years.

It's ......................................................................................................................................................

3. Whenever she went to Paris she bought a new dress.

She never .........................................................................................................................................

4. I spent seven years at secondary school and then I went to university.

After ..................................................................................................................................................

5. It's not worth living to make her change her mind.

There's ............................................................................................................................................

6. He said he was not guilty of stealing the car.

He denied .........................................................................................................................................

7. Is this the only way to reach the city centre?

Isn't there .........................................................................................................................................?

8. He never suspected that the money had been stolen.

At no time ...........................................................................................................................................

9. It's my opinion that you should take more exersise.

If I...........................................................................................................................................................

10. I was going to leave, but because of what he said, I didn't.

She persuaded .....................................................................................................................................

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Lớp 9 Tiếng anh Luyện tập tổng hợp

HH

Huyền Trang Hoàng

24 tháng 4 2017 lúc 21:49

Combine these sentences , using which , where , when : 1 hà nội is the place . i’d like to come to hà nội 2 summer is the time . the weather is very hot then...

Đọc tiếp

Combine these sentences , using which , where , when : 1 hà nội is the place . i’d like to come to hà nội 2 summer is the time . the weather is very hot then 3 the bed was comfortable . i slept in it last night 4 i never forget the park . we met each other for the first time at this park 5 i do not know the reason . she left school for it 6 we have not decided the day . i will go to london on that day 7 our school has a good laboratory . the students practice chemistry in the laboratory 8 our school has a good laboratory. Mr John designed it in 9 ) 7 : 30 is the time . my plane will arrive then 10 i love my parent’s house . i was born in that house

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Lớp 9 Tiếng anh Luyện tập tổng hợp

PT

Phạm Thương

2 tháng 8 2019 lúc 21:45

Use a Relative Adverb to combine each pair of the sentences below. 1. This is the house. We often stay in this house in the summer. 2. That was the time. He managed the enterprise at that time. 3. Ill show you the second-hand bookshop. You can find valuable books in this shop. 4. I never forget the park. We met each other for the first time at this park. 5. The police want to know the hotel. Mr Bush stayed at this hotel two weeks ago. 6. The reasons are basic grammatical ones? Im scolded b...

Đọc tiếp

Use a Relative Adverb to combine each pair of the sentences below.

1. This is the house. We often stay in this house in the summer.

2. That was the time. He managed the enterprise at that time.

3. I'll show you the second-hand bookshop. You can find valuable books in this shop.

4. I never forget the park. We met each other for the first time at this park.

5. The police want to know the hotel. Mr Bush stayed at this hotel two weeks ago.

6. The reasons are basic grammatical ones? I'm scolded by the teacher for these reasons.

7. She doesn't want to speak to the cause. She divorced her husband for this cause.

8. The road is shaded with trees. I go to school on this road every day.

9. I have not decided the day. I'll go to London on that day.

10. He doesn't want to sell the house. He was born in this house.

11. The airport is the most modern one. We are going to arrive at this airport.

12. He was born on the day. His father was away on that day.

13. The days were the saddest ones. I lived far from home on those days.

14. I do not know the reason. Sh left school for it.

15. The bed has no mattress. I sleep on this bed.

16. Our school has a good laboratory. The students practise chemistry in the laboratory.

17. You didn't tell us the reason. We had to cut down our daily expenses for that reason.

18. The book is a telephone directory. We can look up telephone numbers in this book.

19. Mrs Brown rang Dr Brown. He was going to carry out an urgent operation at that moment.

20. This is the house. We have lived there for 5 years.

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Lớp 9 Tiếng anh Luyện tập tổng hợp

H24

Mimi

1 tháng 2 2018 lúc 12:48

1.Children get present ______ Christmas and ______ their birthday. (at ... at / on ... on / on ... at / at ... on) 2. If you are going to the post off ice, would you post a letter ______ me? (to / at / on / for) 3. The windows haven’t been cleaned ______ weeks. (ago / since / for / to) 4. We usually go to our home village at least once ______ the summer. (in / on / to / for) 5. He said that John ______ u p his job. (has given / have given / had given / had to give) 6. When I saw Susa...

Đọc tiếp

1.Children get present ______ Christmas and ______ their birthday. (at ... at / on ... on / on ... at / at ... on) 2. If you are going to the post off ice, would you post a letter ______ me? (to / at / on / for) 3. The windows haven’t been cleaned ______ weeks. (ago / since / for / to) 4. We usually go to our home village at least once ______ the summer. (in / on / to / for) 5. He said that John ______ u p his job. (has given / have given / had given / had to give) 6. When I saw Susan, she said she was taking her driving test ______. (today / the next day / tomorrow / the tomorrow) 7. My TV is broken. I wish it ______ soon. (would be repaired / is repaired / was repaired / will be repaired) 8. I have lived with my parents. I wish I ______ an apartment. (will have / had / would / has) 9. Have you ever wished you ______ to ski when you were younger? (will learn / could learn / learn / can learn) 10. Sometimes he wishes he ______ a different career when he graduates. (can choose / choose / will choose / could choose) 11. Matthew said he was meeting a friend at the station later ______. (that day / yesterday / tomorrow / this today) 12. The astronauts have alrea dy been in orbit ______ two days. (since / for / till / to) 13. We have lunch from 12.00 ______ 1.00. Then we start again go on ______ 5.30. (to ... at / from ... to / to ... to / to ... till) 14. She said that she ______ to learn to drive. (is going / go / goes / was going) 15. She asked me ______ I liked pop music. (if / that / what / when) 16. She said that she was going away for a few days and ______ phone me when she got back. (will / must / would / shall) 17. I’ve lived in this street ______. (in 1998 / for 1 998 / since 1998 / tomorrow) 18. I want two seats for Romeo and Juliet ______ Friday night. (on / in / at / to) 19. Our train arrived in York ______ 6.00. (in / for / on / at) 20. There was an accident at the crossroads ______ midnight last night. (at / fo r / on / in) 21. She said she ______ come to the party on Friday. (won’t / doesn’t / can’t / couldn’t) 22. I’m going to swim ______ Monday with Tom. (at / on / for / of) 23. If my watch is broken, I ______ buy a new one because I always need one. (have to / might / have / may) 24. I have got an awful headache. If I see a chemist’s, I ______ buy some aspirins. (must / might / may / should to) 25. I plan to travel around the world. If I don’t visit my father in Japan this year, I ______ go to the USA. (must / have / may / ought to) 26. If you want to get good grades, you ______ study hard. (must / ought / have / have) 27. Let’s wait ______ it stops raining. (until / for / to / since) 28. I have lived in this house ______. (ago six years / in six years / since six years / for six years) 29. Columbus discovered America ______ the 15th century. (in / since / for / on) 30. The course begins ______ 8 am ______ 5 pm. (from ... during / from ... since / from ... to / in ... to) 31. I fell asleep ______ the movie. (during / si nce / from / for) 32. Bill asked where ______ from. (do I come / did I come / I come / I came) 33. He wonders what ______ with my heavy luggage. (I will do / I would do / will I do / I do) 34. He said that he was coming ______. (tomorrow after / yesterday / the next day / following day) 35. You ______ go to university if you want to study medicine. (has to / will / must / ought) 36. If you want to loose weight, you ______ eat too many sweets. (might not / mustn’t / shouldn’t / may not) 37. She wishes she __ ____ a new bicycle. (can have / will have / has / could have) 38. I ______ it ______ rain so much in this city. (wishes ... didn’t / wish ... didn’t / wished ... don’t / wish ... don’t) 39. If you want to get well, you ______ see a doctor. (must / might / may / ou ght) 40. ______ you ever wish you ______ fly? (Did ... could / Do ... could / Do ... can / Did ... can) 41. If he doesn’t come soon, he ______ be late. (has / ought to / ought / might) 42. I wish I ______ on a beautiful sunny beach now. (would be lying / can be lying / can be lied / could be lying) 43. ______ he will change his job if he go to the USA. (Perhaps / Since / Recently / Lately) 44. He ______ someone ______ answer that telephone. It’s been ringing for about five minutes. (wish ... can / wish ... would / wi shes ... can / wishes ... would) 45. If the kitchen is in a mess, you ______ clean it. (will / might / ought to / may) 46. I wish you ______ so fast. It makes me nervous. (weren’t driving / can’t drive / won’t drive / will not drive) 47. The music next door is very loud. I wish they ______. (would turn it down / can turn down it / will turn it down / turn down it

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Lớp 9 Tiếng anh Luyện tập tổng hợp

HN

Huynh Thuy Nguyen

15 tháng 7 2018 lúc 11:22

1.Manchester is the largest city in the USA. My brother lives there. 2. This is the house. We often stay in this house in the summer. 3. I have recently gone back ti the town. I was born in that town. 4. The airplane is the most modern one. We are going to arrive at the airport. 5. Do you know the name of the hotel? John is staying at the hotel. 6. I never forget the park. We met each other for the first time at the park. 7. The police want to know the hotel. Mr. Bush stayed at this hotel...

Đọc tiếp

1.Manchester is the largest city in the USA. My brother lives there.

2. This is the house. We often stay in this house in the summer.

3. I have recently gone back ti the town. I was born in that town.

4. The airplane is the most modern one. We are going to arrive at the airport.

5. Do you know the name of the hotel? John is staying at the hotel.

6. I never forget the park. We met each other for the first time at the park.

7. The police want to know the hotel. Mr. Bush stayed at this hotel to two years ago.

8. He doesn't want to sell the house. He was born in this house.

9. Dien Bien Phu is the place. Our army won a resounding victory in 1954.

10. That house has many rare sculptures and painting. A famous artist lives in that house.

11. We enjpyed this city. It has been renewed a lot of after the war.

12. We enjoyed this city. We spent our vacation there.

13. This is the house. The house has a big garden.

14. Our school has a good laboratory. Tje students peatice chemistry in the labotary.

15. Our school has a good laboratory. Mr. Phu designed it in 2000.

16. A dictionary is a book. It gives you meanings of the words.

17. The bed was comfortable. I slept in it last night.

18. The bed was comfortable. It has a mattress.

19. This is the house. I was born in that house.

- who, whom, which, that,whose, where, when

Thanks🙏🙇

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Lớp 9 Tiếng anh Luyện tập tổng hợp

HH

Huyền Trang Hoàng

30 tháng 4 2017 lúc 20:32

cau 1 : combine these sentences , using WHICH , WHERE , WHEN : 1 ha noi is the place . i’d like to come to ha noi 2 summer is the time . the weather is very hot then...

Đọc tiếp

cau 1 : combine these sentences , using WHICH , WHERE , WHEN : 1 ha noi is the place . i’d like to come to ha noi 2 summer is the time . the weather is very hot then 3 the bed was comfortable . i slept in it last night 4 i never forget the park . we met each other for the first time at this park 5 i do not know the reason . she left school for it 6. we have not decided the day . i’ll go to london on that day 7. our school has a good laboratory . the students practice chemistry in the laboratory 8. our school has a good laboratory . mr john designed it in 9. 7:30 is the time . my plane will arrive then 10 i love my parents’s house . i was born in that house

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Lớp 9 Tiếng anh Luyện tập tổng hợp

H24

Dương

9 tháng 1 2019 lúc 22:10

1. Better/swimming/weather/

There/than/in/is/going/hot/

nothing/

2. Go on/environment/lives/badly/ if/polluting/our/will/affected/we/the/be/

3. Beautiful/so/that/wanted/go/

again/place/we/there/The/was/to/

4. Wishes/could/English/fluently/native/Viet/he/speak/as/ native/a/as/speaker

5. Holiday/was/The/spent/month/peaceful/town/our/very/we/ last/where

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Lớp 9 Tiếng anh Luyện tập tổng hợp

PA

Pharaoh Atem

5 tháng 8 2019 lúc 11:33

Exercise 1. Put the correct prepositions in the blanks for combination with GET Get away from Get down Get on / along with Get off Get into Get away with Get down to Get over Get off with Get back Get on Get out of Get through 1.He promised to act as chairman, so I’m afraid he can’t get ____ it now. There’s no one else to do it. 2.She is a friendly girl who gets ________ everyone she meets. 3.It took her a long time to get ______ the death of her husband. 4.I tried to ring him u...

Đọc tiếp

Exercise 1. Put the correct prepositions in the blanks for combination with GET Get away from Get down Get on / along with Get off Get into Get away with Get down to Get over Get off with Get back Get on Get out of Get through 1.He promised to act as chairman, so I’m afraid he can’t get ____ it now. There’s no one else to do it. 2.She is a friendly girl who gets ________ everyone she meets. 3.It took her a long time to get ______ the death of her husband. 4.I tried to ring him up but I couldn’t get _____ : I think some of the lines are down after last night’s storm. 5.She talks so much that it is difficult to get _______ from her. 6.Get ______ the bus at Victoria Station. 7.How are you getting _________ your work ? 8.I’m not getting _______ very fast because I can only type with two fingers. 9.We got ______ late because we missed the last train. 10.Don’t worry about my snake. He can’t get _______ his box. 11.This rainy weather is really getting me ________. 12.It’s time you got _______ some serious work. It’s very important to you. 13.Thieves raided the bank and got ________ a lot of money. 14.My boy is getting _________ bad habits, such as smokin, staying up late.... 15.We got _______ immediately after the breakfast. Exercise 2. Put the correct prepositions in the blanks for combination with GIVE Give away Give off Give over to Give up Give back Give out Give in Give oneself up 1.He won 100$ and gave it all ________. 2.Riding is getting too expensive: I’ll have to give it ________. 3.He gave _______all the books he had borrowed. 4.After 4 days of freedom, the escaped prisoner gave himself _______ to local police. 5.Your secret is safe with me. I won’t give it ________. 6.The diver’s supply of oxygen gave __ and he had to be brought to the surface as quickly as possible 7.After his fourth attemp he gave _______ trying to pass the driving test. 8.If you want to save money, give _______ eating in expensive restaurants. 9.There was a man giving _______ leaflets outside the church. 10.She gave ______ state secret to the enemy. 11.Could you give me _______ my pen when you’ve finished using it? 12.Please give your exam papers ______ to the teacher when you’ve finished! 13.The cooker is giving _______ a funny smell. 14.This big hall is given ________ meeting. 15.She’s a gusty player : she never gives __________ Exercise 3. Put the correct prepositions in the blanks for combination with GO Go away Go down with Go on Go out Go through with Go back on Go in for Go off Go round Go up Go down Go into Go over Go through Go with 1.The guard dog went ______ the intruder and knocked him down. 2.He had a sandwich and a cup of coffee, then went _______ working. 3.I went ______ the proposal very carefully with my lawyer and finally decided to to accept his offer. 4.She went ______ a beauty contest and got a prize. 5.The price of tomatoes usually goes ________ in summer in England. 6.If there isn’t enough soup to go ________, just put some hot water in it. 7.You can’t go _______ your promise now: we are depending on you. 8.They have gone _______ all the calculations again but they still can’t find the mistake. 9.The gun went ______ by accident and wounded him in the leg. 10.Mary went ______ in such a hurry that she left her passport behind. 11.Why don’t you go _______ stamp collecting if you want a quiet hobby ? 12.Her weight went ______ to 70 kilos when she stopped playing tennis. 13.When did Britain go ________ EEC ? 14.Our youngest boy has gone __________ mumps! 15.Her blouse doesn’t go _______ her skirt. 16.Finally, I’ve gone ________ all my exams! 17.Which events is he going __________ at the Olympics? 18.The first episode of the film goes ________ next Friday evening at 8 o’clock. 19.There must be a party going _______ next door. They’re making so much noise! 20.The thieves ran away when the burglar alarm went __________. Exercise 4. Put the correct prepositions in the blanks for combination with HAND, GROW, HANG, JUMP Grow on Grow up Hand down Hang about Hang on to Jump at Grow out of Hand over Hand out Hang back Jump on 1.Most of my clothes were handed _____ to me by my older brother. 2.President Bush should hand ______ power to Iraqui elected government. 3.Relief workers were handing _______ emergency rations to the survivors. 4.My daughter is growing _______ very fast. She has grown _______ all her clothes. 5.This book is very interesting. I’m sure it will grow ________ you. 6.You should keep an eye on this stranger. He has been hanging _____ our neighbourhood for hours. 7.At first, he volunteered to help me, but on second thought he was afraid and hung ______. 8.I should hang ______ those oldphotographs–they may be valuable. 9.My maths teacher really used to jump _____ us when we got our answer wrong. 10.If they offered me a job in the USA, I’d jump _______ the chance. Exercise 5. Put the correct prepositions in the blanks for combination with HOLD, KEEP Hold on Hold out Hold up Keep down Keep away Keep off Hold off Hold back Hold with Keep up with Keep back Keep up 1.“ What a terrible news!”, she just managed to hold _________ her anger. 2.I don’t hold _______ his view on education. 3.After the hold–_______, the gang made their getaway in a stolen car. 4.The survivors of the plane crash managed to hold _______ till help came. 5.Her illness is getting worse. Doctors hold ______ little hope of her recovery. 6.Could you hold ______ making decision until next week. I’m trying to find out the best solution. 7.She kept ______ working although she was very tired. 8.They lit a fire to keep wild animals __________. 9.The people in this country have been kept _______ for years by a brutal regime. 10.Keep your voices ________ : your mother is trying to get some sleep. 11.You’re all doing a spendid job. Keep _______ the good work. 12.Police warned by–standers to keep ________ from the blazing building. 13.I can’t keep ________ all the changes in computer technology. 14.She is a good secretary, but she is kept _______ by her ignorance of languages. 15.The country was in a state of rebellion and was only kept _______ by repressive measures. Exercise 6. Put the correct prepositions in the blanks for combination with LAY, LEAVE, LET, LIVE Lay down Lay up Leave out Let off (with) Live on Lay out Leave off Let down Let out Live up to 1.There is a lot of beautiful jewellery laid _______ in the shop window. 2.You should lay _______ some money in the rainy days. 3.You didn’t have any right to lay _______ such hard rules. 4.My name has been misspelt–you’ve left _______ a letter. 5.I wish you’d leave ________ complaining about my cooking. 6.The boy’s getting so fat that his trousers have to be let _____ round the waist. 7.She was let _______ with a fine instead of being sent to prison. 8.He felt he really let the team ________ when he missed the penalty. 9.Don’t let these criminals ________ lightly. 10.As he’s retired, he now lives mainly _________ his pension. 11.My exam results didn’t live _________ my expectations, 12.You can’t live ________ 22 calories a day. Exercise 7. Put the correct prepositions in the blanks for combination with LOOK 1.We are looking ____ you for your help. 2. We must look __ a bit before deciding where to buy a house 3. Police will be looking _ trouble–makers at today’s match. 4. Please look __ on me when you have free time 5.His disappearance is being looked _________ by the police. 6. Do look me __ the next time you’re in London. 6. Children always look _____ their parents. 8. She is looked __ as the leading authority on this subject 9.Who will look ______ the children while their mother is in hospital ? 10.We are so much looking __________ seeing you next week. 11.Look _______ the time of the next trainin the timetable. 12.He was looked _________ because of his humble background. 13.She looked _______ when she heard the noise behind her. 14.Tenants must look __________ the house before they decided to rent it. GIẢI NHANH MÌNH TICK CHO NHA

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Lớp 9 Tiếng anh Luyện tập tổng hợp

HH

Huyền Trang Hoàng

10 tháng 5 2017 lúc 21:15

cau 1 : give the correct form of verbs given : 1 i am sorry . i ( not finish ) ................... this work yet 2 poems as well as play (write) ................. by william shakespe...

Đọc tiếp

cau 1 : give the correct form of verbs given : 1 i am sorry . i ( not finish ) ................... this work yet 2 poems as well as play (write) ................. by william shakespeare 3 how many times you (be)................... to van mieu? 4 they like (chat) ................... they use the internet very often 5 i (have) .................a phone call while i (surf) ............ the wed yesterday cau 2 : 1 in recent years , more and more people ............... for things with credit cards a pay b paid c are paying d have been paying 2 what people .................. benetton stores is that the quality is always high a like b like very much c like about d like a lot 3 paplo would like to ......................by the time he is 40 a travel b be traveling c be going to travel d have traveled 4 the world would be a better place if everyone showed ..............cooperation as john a as much b so much c too much d much 5 he turned on the tv , ................... i thought was rather surprising a and b so c that d which 6 my car would not start , ............................ jenny is started immediately a whereas b though c however d nevertheless 7 they stayed for hours , which i was very .................. a annoyed b annoyed about c annoying d annoying me 8 that was a very strange question ............................................. a you ask b you are asking c for asking d to ask 9 ..............................a movie to be entertaining , it has to have an interesting story a so that b in order that c in order for d in order to cau 2 : rewrite the following snetences : 1 would you please give me a hand ? >> would you mind ................................. ? 2 i can not understand him because he speaks so quickly >> if he did not ........................................... 3 although he took a taxi , he arrived late for the concert ..>>in spite of .................................................... 4 the suitcase is so heavy that i can not carry it >> it is such .............................................. 5 people say that he is an excellent footballer . >> he is ................................................................. 6 my mother used to make us clean the house ....>> we used ........................... 7 it is two years since i last spoke to her >> i have not ....................................... 8 going swimming in the river in the summer is interesting >> it ................................. cau 3 : give the corect form ò verbs given : 1 if he saves up , he soon ( be able ).................to afford a new car 2 what a mess! duc is toys ( not put ) .................. away 3 if you feel like (stay ) ................with us , just send us a fax 4 my sister and i (stay ) ...................... at our grandparents when we (meet ) ............our great grand aunt for the first time

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Lớp 9 Tiếng anh Luyện tập tổng hợp

Luyện tập tổng hợp

Khoá học trên OLM (olm.vn)

Khoá học trên OLM (olm.vn)

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Khoá học trên OLM (olm.vn)

Khoá học trên OLM (olm.vn)