1. since
2. for
3. for
4. since
5. for
6. since
7. for
8. for
9. since
10. for
EX4:
1. have been
2. have studied
3. visits
4. have you seen her today ?
5. has done
6. went
7. haven't seen
8. met
9. have been
10. visit
11. have found
12. has improved / left
13.have bought / haven't worn
14. haven't seen / left
15. moved / were
16. has lived / went
17. have lost / Have you seen / wore / have worn / left
18. Have you ever tried / have tried / found / started
19. has lost / has been / lost / has been
Mình mong là mình đúng. *Chúc bạn học tốt*