Chia dạng đúng của từ : 1.a weather (forecast) is a person who scientifically studies weather conditions and says what the weather is likely to be in the future 2.He has always demanded the highest...

Chia dạng đúng của từ : 1.a weather (forecaster) is a person who scientifically studies weather conditions and says what the weather is likely to be in the future 2.He has always demanded the highest standards of (behaviour) from his children 3.Contratry to all our (expectation) , he's found a well-paid job and a nice girlfriend 4.(volcano) ash showered down on the town after eruption 5.Many people are very concerned about the (destruction) of the rain forest 6.The talks ended ( abruptly) when one of the delegations walked out in protest 7.I worry about the (destroying) effect that violent films may have on children 8.All cigarette packets carry a government health (warnning) 9.The side effects of the new drug are being (extensively) researched in detail 10.The (coasted) resorts are empty in winterCâu trả lời: Chia dạng đúng của từ : 1.a weather (forecaster) is a person who scientifically studies weather conditions and says what the weather is likely to be in the future 2.He has always demanded the highest standards of (behaviour) from his children 3.Contratry to all our (expectation) , he's found a well-paid job and a nice girlfriend 4.(volcano) ash showered down on the town after eruption 5.Many people are very concerned about the (destruction) of the rain forest 6.The talks ended ( abruptly) when one of the delegations walked out in protest 7.I worry about the (destroying) effect that violent films may have on children 8.All cigarette packets carry a government health (warnning) 9.The side effects of the new drug are being (extensively) researched in detail 10.The (coasted) resorts are empty in winter

Chia dạng đúng của từ : 1.a weather (forecast) is a person who scientifically studies weather conditions and says what...

Hãy tham gia nhóm Học sinh Hoc24OLM

TT

trần trang

17 tháng 4 2019 lúc 21:58

Use the correct form of the word given at the end of each sentence: 1) If we keep on ... the air, more people will suffer from respiratory diseases. (pollution) 2) ... are interested in the protection of the environment. (conserve) 3) We find advertising on television very ... . (effect) 4) Nobody likes him because hes so ... . (considerate) 5) His generosity ... him from others. (distinguish) 6) Who encourages the use of ... friendly products? (environment) 7) One of the most important...

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Use the correct form of the word given at the end of each sentence:

1) If we keep on ... the air, more people will suffer from respiratory diseases. (pollution)

2) ... are interested in the protection of the environment. (conserve)

3) We find advertising on television very ... . (effect)

4) Nobody likes him because he's so ... . (considerate)

5) His generosity ... him from others. (distinguish)

6) Who encourages the use of ... friendly products? (environment)

7) One of the most important ... for Vietnamese people is Tet. (celebrate)

8) Many chemicals have a ... effect on the environment. (disaster)

9) That is the girl who luckily escaped from a ... eruption last month. (volcano)

10) The ... of their house left them no place to live. (destroy)

11) That tsunami was the most ... of the year 2004. (disaster)

12) Since the world's energy resources are limited, we must ... them. (conservation)

13) These ... will conserve the Earth. (innovate)

14) ... is now a serious problem in Viet Nam. (forest)

15) We are trying to prevent a(n) ... world. (pollute)

16) Vehicles also account for air ... in the cities. (pollute)

17) We should pay attention to genetic and ... influences on infant sleep. (environment)

18) We are responsible for the truth that our forest is being ... . (destroy)

19) Sometimes it can be difficult to stay motivated and ... at work. (effect)

20) The company is trying to create a young ... image. (energy)

21) Thomas Edison is one of The 12 greatest ... of all time for inventing the first long-lasting light bulb. (innovate)

22) Because of being an ... person, he has made that mistake. (experience)

23) Energy ... should be reduced. (consume)

24) We were all impressed by the speed and ... of the new system. (efficient)

25) My ... is to earn more money to help my family. (prior)

26) There have been many ... in the field of electrical engineering. (innovate)

27) Mount Pinatubo was the world's largest ... eruption in more than 50 years. (volcano)

28) The new law will become ... next week. (effect)

29) Speech ... human being from the animals. (distinct)

30) Thousands of people were ... killed in that morning. (disaster)

31) Teacher's Day has been ... widely since 1982. (celebrate)

32) Thousands of people died in the ... . (disastrous)

33) They always show an understanding of what ... want. (consume)

34) We worry about the ... effects that violent films have on children. (destroy)

35) Earthquakes often come together with volcanic ... . (erupt)

36) All this shows that the machine works ... . (effective)

37) People must learn about keeping the environment ... . (pollute)

38) Halloween is an interesting festival which is ... in many countries. (celebrate)

39) His ... is always his family. (prior)

40) I am so ... with my result of last exam. (satisfy)

41) Everything is going ... . (satisfy)

42) By the year of 2015, all the roofs will be ... by solar energy. (hot)

43) Thousands of people were saved because ... have warned about the eruption. (science)

44) Henry ... himself on his ability to predict what the weather will be like. (proud)

45) We all try to prevent ... to protect our environment. (forest)

46) My brother was ... as the most effective activist in the school charity program. (nomination)

47) He is still young, but he is an ... doctor. (experience)

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Lớp 9 Tiếng anh Luyện tập tổng hợp

TT

trần trang

21 tháng 3 2019 lúc 18:40

Word form: 1) Mount Pinatubo was the worlds largest ... eruption in more than 50 years. (volcano) 2) The new law will become ... next week. (effect) 3) Speech ... human being from the animals. (distinct) 4) Thousand of people were ... killed in that morning. (disaster) 5) Teachers Day has been ... widely since 1982. (celebrate) 6) Thousand of people died in the ... . (disastrous) 7) They always show an understanding of what ... want. (consume) 8) We worry about the ... effects that v...

Đọc tiếp

Word form:

1) Mount Pinatubo was the world's largest ... eruption in more than 50 years. (volcano)

2) The new law will become ... next week. (effect)

3) Speech ... human being from the animals. (distinct)

4) Thousand of people were ... killed in that morning. (disaster)

5) Teacher's Day has been ... widely since 1982. (celebrate)

6) Thousand of people died in the ... . (disastrous)

7) They always show an understanding of what ... want. (consume)

8) We worry about the ... effects that violent films have on children. (destroy)

9) Earthquakes often come together with volcanic ... . (erupt)

10) All this shows that the machine works ... . (effective)

11) People must learn about keeping the environment ... . (pollute)

12) Halloween is an interesting festival which is ... in many countries. (celebrate)

13) If we keep on ... the air, more people will suffer from respiratory diseases. (pollution)

14) ... are interested in the protection of the environment. (conserve)

15) We find advertising on television very ... . (effect)

16) Nobody likes him because he's so ... . (considerate)

17) His generosity ... him from others. (distinguish)

18) Who encourages the use of ... friendly products? (environment)

19) The company must reduce costs to compete ... . (effect)

20) If you are ... with your essay, I suggest you rewrite it. (satisfy)

21) He has been ... as the representative of his company. (normination)

22) ... friendly energy sources include water and wind power. (environment)

23) A tidal wave is strong enough to cause ... . (destroy)

24) There are twenty ... for that job. (apply)

25) Are you writing a ... letter to our local authority? (complain)

26) There have been many ... in the field of electrical engineering. (innovate)

27) The most ... earthquake occured in Japan in 1923. (disaster)

28) Most buildings in this city are ... by solar energy. (hot)

29) I hope that everything go on ... . (satisfy)

30) My sense of humor ... me from others. (distinction)

31) Vehicles also account for air ... in the cities. (pollute)

32) We should pay attention to genetic and ... influences on infant sleep. (environment)

33) We are responsible for the truth that our forest is being ... . (destroy)

34) Sometimes it can be difficult to stay motivated and ... at work. (effect)

35) The company is trying to create a young ... image. (energy)

36) Thomas Edison is one of The 12 greatest ... of all time for inventing the first long-lasting light bulb. (innovate)

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Lớp 9 Tiếng anh Luyện tập tổng hợp

H24

Dương

21 tháng 10 2018 lúc 22:11

1. If we use much pesticide on vegetables, they will becomes......and inedible (Poison) 2. Our.........bill has increased this month (Electric) 3. An..........amount of water has been wasted since last year. (Enormousness) 4. Its..........when going out without turning the lights off. (Waste) 5. A........hotel will be built in the town next month. (luxury) 6. People held a meeting against the.........policy of the government. (Effect) 7. A new policy takes a.........this month. (Effect...

Đọc tiếp

1. If we use much pesticide on vegetables, they will becomes......and inedible (Poison)

2. Our.........bill has increased this month (Electric)

3. An..........amount of water has been wasted since last year. (Enormousness)

4. It's..........when going out without turning the lights off. (Waste)

5. A........hotel will be built in the town next month. (luxury)

6. People held a meeting against the.........policy of the government. (Effect)

7. A new policy takes a.........this month. (Effective)

8. Most os American...........got two more television sets at home. (House)

9. Hundreds died or lost due to natural..........last year. (Disastrously)

10. A nuclear explosion is the most..........because it can be destroyed everything. (Disastrously)

11. Researchers found some........rocks. They are in some active.......... (Volcano)

12. He is.........to pass the final exan, so he feels pressured by the high..........of his parents. (Expect)

13. The weather is...........to rain tomorrow, so remember take umbrella with you. (Predict)

14. A fortune teller often give some...........for your future but I don't think that can be........ (Predict)

15. My old friend came to see me........... I felt uncomfortable due to that............ (Abrupt)

16. This power..........will last at least two more hours.(Fail)

17. It's many years since this volcano last.......... I really want see the...........of the volcano but I'm also afraid (Erupt)

18. She doesn't mind their.........and keeps going. (Warn)

19. An carthquake........the village last month. (Destroy)

20. A.........storm is coming to the land, so many people are afraid if its..........to the city. (Destroy)

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Lớp 9 Tiếng anh Luyện tập tổng hợp

VP

Vinh Phạm

22 tháng 5 2019 lúc 8:33

1. We have to ..............................all the new words in the notebook ( memory ). 2. ...................... waves are one of the great forces of nature . They are very dangerous for people ( tide). 3. Tsunamis, earthquakes and typhoons are ............................ disasters ( nature). 4. A typhoon is going to his our area . What sorts of ............................... shall we make?( prepare). 5............................. food are very convenient for campers ( can ). 6....

Đọc tiếp

1. We have to ..............................all the new words in the notebook ( memory ). 2. ...................... waves are one of the great forces of nature . They are very dangerous for people ( tide). 3. Tsunamis, earthquakes and typhoons are ............................ disasters ( nature). 4. A typhoon is going to his our area . What sorts of ............................... shall we make?( prepare). 5............................. food are very convenient for campers ( can ). 6. Today.................................can...............................when the earthquake will occur ( science/prediction ). 7. The mountain was full of .............................rock and ash when the ........................ was over ( volcano/erupt). 8. Thousands of people have been made ................................. by flooding ( home ). 9. If we want to look after the environment , we should protect...............................rainforest ( tropic). 10. Many people were ............................... killed in that storm ( disaster ). 11. The lava ........................as it cools ( solid ). 12. "You look nervous"."Thunder makes me ...................................." ( terrify ). 13. The weather is so........................ that I don't know that should take an umbrella or sun-tan lotion ( predict). 14. .............................., people eat....................... rice cakes at Tet ( tradition/stick). 15. We went to the shop downtown to by some .............................. ornament ( decoration )

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Lớp 9 Tiếng anh Luyện tập tổng hợp

LD

Linhh Dang

12 tháng 2 2020 lúc 10:35

Ex1. Choose the correct form of the verb that agrees with the subject. 1. Either my shoes or your coat (is / are) always on the floor. 2. George and Tamara (doesnt / dont) want to see that movie. 3. Maths (is / are) Johns favorite subject, while Civics (is / are) Andreas. 4. The committee (leads / lead) very different lives in private. 5. Eight dollars (is / are) the price of a movie these days. 6. The student council (is / are) meeting today. 7. A number of students (was / were) late for...

Đọc tiếp

Ex1. Choose the correct form of the verb that agrees with the subject.

1. Either my shoes or your coat (is / are) always on the floor. 2. George and Tamara (doesn't / don't) want to see that movie. 3. Maths (is / are) John's favorite subject, while Civics (is / are) Andrea's. 4. The committee (leads / lead) very different lives in private. 5. Eight dollars (is / are) the price of a movie these days. 6. The student council (is / are) meeting today. 7. A number of students (was / were) late for class yesterday. 8. The man with all the birds (live / lives) on my street. 9. 40% of the students (is / are) very unhappy with the university life. 10. The Olympic Games (are / is) held every four years.

Ex2. Choose the correct form of the verb that agrees with the subject.

1. The basketball team (has / have) a new coach. 2. The police (has / have) arrested three suspects. 3. A pound of cookies (cost / costs) about a dollar. 4. Four times eight (are / is) thirty-two. 5. Some of this book (is / are) not very entertaining. 6. The large number of fans (is / are) a big problem for the police. 7. Along the street leading to the stadium (is / are) many tall trees. 8. The value of cars and motorcycles (has / have) increased. 9. Parts of the latest news (is / are) incorrect. 10. 90% of the people in our town always (vote / votes) in local elections.

Ex3. Choose the correct form of the verb that agrees with the subject.

1. Six gallons of milk (are / is) still in the refrigerator. 2. The sound of passing cars (echo / echoes) through the streets. 3. Two pieces of pie (was / were) eaten before dinner. 4. The anthology of short stories (include / includes) at least one story from Poe. 5. A lady with 10 cats (live / lives) in that big house. 6. Of the ten teams, ours (is / are) the best. 7. Neither the basket nor the oranges (was / were) cheap. 8. There (is / are) a dog, a cat, and a bird in the garage. 9. Half of the class (is / are) from another country. 10. 40% of the country (doesn’t / don’t) support the new law.

Ex4. Choose the correct form of the verb that agrees with the subject.

1. The PM, together with his wife, (greets / greet) the press cordially. 2. All of the CDs, even the scratched one, (is / are) in this case. 3. The movie, including all the previews, (take / takes) about 2 hours to watch. 4. The players, as well as the captain, (want / wants) to win. 5. The man, as well as his two children, (stay / stays) in a motel. 6. My boss, who is extremely kind to his employees, (gives / give) us very helpful advice. 7. My sister, not my brothers, (live / lives) in Canada. 8. On Sundays, I and Jack, along with our aunt, often (go / goes) to church. 9. The decision made by the leaders (was / were) definitely the right one. 10. Mumps, an infectious disease, (cause / causes) painful swellings in the neck.

Ex5. Choose the correct form of the verb that agrees with the subject.

1. Our swimming club (is / are) going to compete on Saturday. 2. Rain or sleet (is / are) predicted for tomorrow. 3. Your hands and feet (contain / contains) nearly half the bones in your body. 4. The leader as well as his brothers (belong / belongs) to the same tribe. 5. The students accompanied by their teacher (have / has) gone on a picnic. 6. The poor (are / is) always at a disadvantage. 7. My family (have / has) decided to move to Nottingham. 8. Many a student (have / has) made the same mistake. 9. Neither his father nor his mother (play / plays) mahjong. 10. The visiting times (is / are) between 8 pm and 10:30 pm.

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Lớp 9 Tiếng anh Luyện tập tổng hợp

HH

Huyền Trang Hoàng

10 tháng 5 2017 lúc 20:34

1 john ............ ( lose ) his job last month and since then he ..........(be) out of work - do you know why he .............( lose) his job ? - because he ................. (be) very rude to his boss...

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1 john ............ ( lose ) his job last month and since then he ..........(be) out of work - do you know why he .............( lose) his job ? - because he ................. (be) very rude to his boss 2 yesterday morning , when i ....... . ( arrive) at the airport , sophie ....... ..(wait ) for me . she ....... ...(wear) a pink dress and ... ...look very pretty cau 2 : 1 mark twain was born in missouri ..............(on/for/in )1835 2 fresh air is ............(of/about / in) great use to our health 3 he will not pass the exam ...............(if/unless/or) he works hard 4 my father often goes to church ............(with/at/on) sundays 5 surfing is one way..........(of/at/on) spending free time in australia 6 they are the children..............( whose /who/ whom ) won the match yesterday 7 tom has been living here .............. (for/since/in) six years 8 we would go camping ..............(although/if/ but) the weather were fine cau3 : pewrite the following sentences : 1 the remark was so unexpected that did not know what to say >> it was .................................................... 2 you are the worst guitarist in the world >> no one .................................................... 3 it is 3 years since i last saw nam >>>>> i have not ................................................................. 4 keeping the environment clean is very inportant >> it is .........................................................................

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Lớp 9 Tiếng anh Luyện tập tổng hợp

NN

Nguyễn Kim Ngân

24 tháng 9 2018 lúc 10:03

I. Read the passage and choose the best answer from A, B, C or D. LIFE OF A MAN Thomas is now in his sixties, and is one of the many homeless people who live on the streets he buys a newspaper most days. Today, with his fellow tramps, he reads about yesterday’ s student demonstration. Like many of the tramps that live under the bridge in New York, Thomas was not always so poor. A long time ago he was in the Navy, and like many who have been to sea for a long time, he has stayed slim and...

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I. Read the passage and choose the best answer from A, B, C or D. LIFE OF A MAN Thomas is now in his sixties, and is one of the many homeless people who live on the streets he buys a newspaper most days. Today, with his fellow tramps, he reads about yesterday’ s student demonstration. Like many of the tramps that live under the bridge in New York, Thomas was not always so poor. A long time ago he was in the Navy, and like many who have been to sea for a long time, he has stayed slim and fit. Despite the strict organization on board ship, he loved the life, and had the opportunity to see many countries. He visited Poland and Russia; in South Africa he realized what he valued in each country was the people he met. He was always astonished and delighted by the ways in which the people he met differed from one country to another. Some day, he hopes, everyone will see the world as he does. After many happy years in Navy, he had to retire. The good things in life always come to an end. His mother and father had long since died and he’d lost touch with his other relatives. He came to New York and became an industrial designer. He was happy, although it wasn’t the same as the sea. He never wanted to get married and have children. And then there was the period of darkness. He smiles sadly. He shrugs his shoulders and looks at his hands. There are tears in the corners of his eyes. This is something that he cannot bring himself to talk about. “It all went wrong”, he whispers. He was silent for a minute; then recovered. He began to talk more loudly. “Look at me now it makes me angry. And what about the President? He’s been in power for years, and look what he’s done for us. Nothing! I’m still out on the streets and live the life of a tramp.” 39. It would appear that Thomas _________ A. has organized a protest recently. B. takes an interest in important events. C. has no contact with other homeless people. D. is not as poor as he used to be. 40. When Thomas was in the Navy, he _________ A. only visited three countries. B. enjoyed the strict life on board ship. C. was very well paid for the job he did. D. liked meeting people from different countries. 41. Thomas changed his job because he _________ A. was too old to stay in the Navy. B. wanted to start a family. C. wanted to be near his relatives in New York. D. did not enjoy the work any more. 42. Thomas lost his job and became a tramp because _________ A. he did not have any family. B. he was tired of doing normal job. C. of reasons he does not want to discuss D. of the death of his parents. 43. The text states that Thomas thinks the President _________ A. should not allow home people to stay on the streets. B.should increase pensions for oldpeople. C. has not had enough time to change things. D.should have done more to help people like him

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Lớp 9 Tiếng anh Luyện tập tổng hợp

QT

Quỳnh Anh Tong

14 tháng 7 2019 lúc 10:18

Exercise 2: Choose the corect answer in the parentheses 1. The weather in the southern states ( gets, get) very hot during the summer. 2. The result of Dr. Noll’s experiment( was,were) published in a scientific journal. 3. Bob and his friends( is,are) coming to the anniversary party tomorrow night. 4. Every man, woman, and child (is,are) protected under the law. 5. Washing the dishes (is, are) the children’ job 6. A lot of the students (is, are) already here. 7. Som...

Đọc tiếp

Exercise 2: Choose the corect answer in the parentheses

1. The weather in the southern states ( gets, get) very hot during the summer.
2. The result of Dr. Noll’s experiment( was,were) published in a scientific journal.
3. Bob and his friends( is,are) coming to the anniversary party tomorrow night.
4. Every man, woman, and child (is,are) protected under the law.
5. Washing the dishes (is, are) the children’ job
6. A lot of the students (is, are) already here.
7. Some of the furniture in our apartment (is, are) secondhand
8. Some of the desks in the classroom (is, are) broken.
9. At least three-quarters of that book on famous Americans (is, are) about people who lived in the 19th century
10. One of the coutries I would like to visit (is, are) Italy.
11. Some of the cities I would like to visit (is, are) Rome and Vience
12. Each student in the class (has, have) to have a book.
13. Each student in the class (has, have) to have a book.
14. None of the students ( was,were) late today.
15. the number of students in this room right now (is, are) twenty.
16. A number of students in the class ( speaks,speak) English well.
17. There (is, are) some interesting pictures in today paper.
18. There (is, are) an incorrect statement in that newspaper article.
19. The United States (is, are) lacated in North America.
20. Economics (is, are) Don’s favourite subjects.
21. Ten minutes (is, are) more than enough time to complete this exercise.
22. Most people (likes,like) to go to the zoo.
23. The police (is, are) coming. I’ve already called them.
24. Japanese (is, are) very difficult for English speakers to learn.
25. the Japanese (has, have) a long and interesting history.
26. The old in my country (is, are) cared for by their children and grandchildren.
27. This exercise on singular- plural agreement of subjects and verbs (is, are) easy.
28. The extent of Jane’s knowledge on various complex subjects ( astounds. Astound: lam kinh ngac) me.
29. The subjects you will be studying in this cource (is, are) listed in the syllabus.
30. Massachutes andConnecticut (is, are) located inNew England.
31. Only the black Widow spider, or all of the spiders in the United States, ( has,have) caused death among human being.
32. The professor and the student ( agree, agrees) on that point.
33. Almost every professor and student at the Universary ( approves, approve) of the choice or Dr.Brown as the new president
34. Each girl and boy in the sixth- grade class( has,have) to do a science project.
35. Getting to know students from all over the world (is, are) one of the best parts of my job.
36. Annie had a hard time when she was coming home from the store because the bag of groceries ( was,were) too heavy for her to carry.
37. where ( do, does) your parents live?
38. Why ( was,were) Susan and Alex late the meeting?
39. (Is, are) having the respondsibility for taking care of pets good for young children?
40. Some of the fruit in this bowl (is, are) rotten
41. Some of the apples in that bowl (is, are) rotten
42. Half of the students in the class (is, are) from Arabic- speaking countries.
43. Half of this money ( belong, belongs) to you.
44. A lot of students in the class (is, are) from Southeast Asia.
45. A lot of clothing in those stores (is, are) on sale this week.
46. One of my best friends (is, are) coming to visit me next week.
47. Each boy in this class ( has,have) his own notebook.

Giúp mk với, mk đag cần gấp

Thanks

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Lớp 9 Tiếng anh Luyện tập tổng hợp

H24

English

1 tháng 6 2019 lúc 13:37

10. Dùng động từ trong ngoặc ở dạng dúng The worlds first computer (1) ..........(build) at the University of Pennsylvania in 1946,although computer-like machines (2).........(build) in the 19th century.Computers(3)..........(sell)commercially for the first time in the 1950s, and progress (4)..........(make)since than.Computers are now much smaller and more powerful, and they can (5).........(buy)much more cheaply. Computers (6).........(use) in many fields - in business, science, medicine and e...

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10. Dùng động từ trong ngoặc ở dạng dúng The world's first computer (1) ..........(build) at the University of Pennsylvania in 1946,although computer-like machines (2).........(build) in the 19th century.Computers(3)..........(sell)commercially for the first time in the 1950s, and progress (4)..........(make)since than.Computers are now much smaller and more powerful, and they can (5).........(buy)much more cheaply. Computers (6).........(use) in many fields - in business, science, medicine and education. They can (7).........(use) to forecast the weather or to control robots which make cars. The computer's memory is the where information (8).......... (keep) and calculations (9)..... (do). A computer can not think for place itself. It must (10) ..........(tell) exacly what to do.A lot of calculations can (11).........(do)very quickly on a computer Computer don't make mistakes. Stories (12) .........(hear) sometimes about computers paying people too much money or sending them bills for things they didn't by. These mistakes (13) .........(make)by the programmers. Some years ago, an American computer-controlled rocket went out of control and had(14)......... (destroy). The accident (15) .........(cause) by a small mistake in one line of the program,which cost the USA 18 million dollars. Criminals have found that "computer crimes" are a lot easier than robbing banks. Hundreds of millions of dollars (16)..........(steal)from bunesses every by people changing the information in computers. Large numbers of home computers (17).........(sell) recently. People know more about computers than they used to, and computers are playing a bigger part in our lives. Progress (18).......... .(make) all the time. Many people believe we can look forward to the day when even our household jobs like cleaning and decorating (19)........(do) by computer-controlled robots.

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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)