Mình xin lỗi nhưng bạn có thể chụp từng bài được không ^^ , mình nhìn không rõ 

3, Students American do not usually wear school uniforms.

4, Nam has Science class on Wednesday at 10:00.

5,  I like Math because it is interesting.

6, What subject does Tom like best?

7, We want to work with you.

9, Excuse me! Is there a post office near here?

12, They are talking about their class.

13, We study many things at school.

15, Mai is interested in doing experiments.

16, What is Lan's television number?

\(\dfrac{7x-2}{3}-2x< 5-\dfrac{x-2}{4}\)

<=>\(\dfrac{4\left(7x-2\right)}{12}-\dfrac{24x}{12}< \dfrac{60}{12}-\dfrac{3\left(x-2\right)}{12}\)

<=>\(4\left(7x-2\right)-24x< 60-3\left(x-2\right)\)

<=>\(28x-8-24x< 60-3x+6\)

<=>\(28x+3x-24x< 60+8+6\)

<=>\(7x< 74\)

<=>x<\(\dfrac{74}{7}\)

Vậy...

B

B

B

1. Nowadays, many children are used to connecting the Internet everyday.

2. I couldn't keep in touch with him before because I had lost his phone number.

3. They have been working for this company for thirty years and they will retire next year.

4. We were delighted to receive your letter yesterday.

5. When we saw them, they were trying to find a new house near their workplace.

1 off

2 down

3 to

4 down

5 from

6 with

7 up

8 off

9 forward

10 down

off

down

with

down

from

to

up

off

forward

down

1. off

2. down

3.to

4. down

5.from

6. with

7. up

8. off

9. forward

10. down

1 turned it down

2 worn out

3 call off

4 turn up 

5 came across

6 carried out

7 broken into

8 gave up

9 took - off

10 set up

Refer =))

1.turn it down

2.worn out 

3.call off : trì hoãn

4.turn up : xuất hiện/được tìm thấy

5.come across

6.carry out

7.broken into

8.give up 

9.take her clothes off 

10.set up 

turned .. down

worn out

call off

turn up

came across

carried out

broken into

gave up

took off

set up

1. When did he last write to you?

2. How long is it since he talked to you?

3. How long is it since you telephoned him?

4. How long is it since you learned to drive?

5. How long ago did you learn spanish?

1 is he leaving - will be playing

2 are training

3 were you doing - called

4 had finished - went

5 don't really expect - smells

6 do you feel - think

8 have you been doing

9 got - had begun

has won

have you sat

have sat

have been sitting

have been playing

have played

has raised 

has been lecturing

has never missed

has been sleeping

has slept

1 retirement

2 unemployment

3 wooden

4 observation

5 researchers

6 psychologist

7 building

8 importance

9 introductory

10 technologically