1. a.
2. d.
3. chọn đáp án có từ "the"
4. d
5. d
6. b
7. b
8. a
9. b
10. c
11. b
12. c
13. washes
14. will give
15. watching
16. had
17. different
18. increased
19. summer
20. plane
21. climbed
22. in
23. He used to learn English at school and university.
24. He wants to improve his writing skills because sometimes he has to write letters in English.
25. Quang thinks English is very useful and interesting.
26. Rice is grown in tropical countries.
27. They last saw their parents 3 months ago.
28. I wish I could go to the party with you.
29. I asked the tourists if they would go to Phong Nha Cave the following day.
30. People of all ages in the world are interested in using the Intenet.
31. If she spends more time learning English, she will pass the examination easy.