13. D
14. A
15. C
16. D
17. B
18. B
19. D
20. B
III.
1. which/ that
2. whose
3. whom/ who
4. whom
5. which
6. which
7. that/ which
8. who/ whom/that
9. where
10. why
11. that/ who
12. that
13. whose
14. which/ that
15. which
IV.
1. The woman I wanted to meet was away on holiday.
2. We know many people who are studying and working in Ho Chi Minh City.
