Bài II:
1. have known
2. haven't seen
3. be taken
4. repaired
5. Will you rebuild
6. Have you ever been/ haven't gone
7. grow
8. do
9. have just introduced

10. has seen
11. has read
III.
1. We have driven car for a year
2. They started to working in that company in 2001
3. Lan didn't write to Maryan last month
4. I have played the piano for 10 years
5. How long have you listened to classical music?

III.
6. Jeans are sold all over the world
7. Five....champagne will be produced in France next year
8. Jean cloth was made completely form cotton in the 18th century
9. Two department stores have been built this year
10. Many trees are going to be planted in this area
11. This exercise must be done carefully
12. The problem can be sloved

Bài IV.
1. c
2. e
3. b
4. a
5. d 
Bài V.
1. on