V)

21 . B

22 . B

23 . C

24 . B

25 . D

Bài VI

1,carefully 

2,well

3,useful

4,dangerous

Bài VII

1,shall we 

2,haven't you 

3,did he 

4,aren't I

Bài VIII

1,My grandmother used to grow sunflowers but she didn't anymore 

2,Although she had not finished the report, she went to sleep

3,In spite of being muddy, the children walk to school 

4,She will be invited to my birthday party tomorrow 

5,America has less population than China 

6,When I was young, I didn't use to listen folk music, but now I prefer to love it