1. knew
2. corresponded
3. Buddhism
4. saw
5. on
6. used to take
7. Nice to meet you
8. Like
9. friendliness
10. compulsory
11. used to be
12. had
13. separated into
14. have you waited
15. so
16. at/ on
17. reviewed all her lessons carefully
18. pen pals
19. used to walk
20. so
II.
1. b
2. c
3. a
4. c
5. b
6. d (thousand phải có thêm s)
7. b
8. a


