12. C

13. D

14. A

15. C

IV

1. most difficult

2. worse

3. best

4. more pretty

5. smallest

6. more modern

7. most expensive

8. bigger

9. the most itelligent

10. the tallest

V

1. have / read

2. has had

3. have known / was

4. get

5. haven't seen

6. Did / stay

7. have watched

8. has collected

9. Do (you) clean

10. talks

VI (trong ngoặc từ sai trong câu)

1. to rain (raining)

2. have known (knew)

3. haven't seen (didn't see)

4. has been (was)

5. went (have gone)

6. have moved (moved)

7. learnt (learn)

8. has been (was)

VII

1. B

2. B

3. B

4. D

5. D

12. C

13. D

14. A

15. C

 IV

1. most difficult

2. worse

3. best

4. more pretty

5. smallest

6. more modern

7. most expensive

8. bigger

9. the most intelligent

10. the tallest

V

1. have - read

2. has had

3. have known - was

4. get

5. haven't seen

6. Did - stay

7. have watched

8. has collected

9. Do - clean

10. talks

VI

1. raining thành to rain

2. knew thành have known 

3. didn't see thành haven't seen 

4. was thành has been 

5. have gone thành went 

6. moved thành have moved 

7. learn thành learnt 

8. was thành has been

VII

1. B

2. B

3. B

4. D

5. D