1. D

2. D

3. C

4. D

5. D

6. A

7. D

8. A

9. D

10. C

1. aren't I?

2. shall we?

3. can't you?

4. isn't it?

5. do they?

6. don't they?

7. do he?

8. aren't they?

9. isn't it?

10. aren't these?

11. isn't it?

12. will you?

13. does he?

14. isn't he?

15. aren't I 

1. since - for.

2. for - since.

3. when - since.

4. since - for.

5. for - since.

6. is - was.

7. when - since.

8. have done - did you do.

9. has started - started.

10. However - bỏ do ko hợp lệ.

11. while - since.

12. to have - having.

2. stole.

3. chose.

7. took ; found ; didn't know ; wasn't ; didn't want ; went ; made ; heated ; seemed ; wasn't.

8. likes ; worry ; trust ; graduated ; went ; didn't travel ; rented ; rode ; was ; worried ; were ; saw ; knew.  

1. had

2. did

3. did you do

4. visited

5. have you known

6. have ever eaten.

7. does your sister listen

8. have been

9. will you do - rains

10. won't rain

11. is she doing

12. hasn't spoken - came.

13. is sleeping

14. did you earn

15. has never seen

16. was - ate

17. have just painted

2. stayed.

3. swam.

4. jumped.

5. held.

6. fighted.

7. taught.

8. freezed.

9. thought.

10. called.

11. rode.

12. sold.

2:

A. Did he see

B. Yes, he did. He saw

No, he didn't. He didn't see

3:

A. Did they watch

B. Yes, they did. They watched

No, they didn't. They didn't watch 

4: 

A. Did you understand

B. Yes, I did. I understood

No, I didn't. I didn't understand

5:

A. Was you

B. Yes, I was. I was

No, I wasn't. I wasn't

lỗi

lỗi.