1. B
2. A
3. B
4. C
5. C
6. a.disappointing/b.disappointed
7. a.exciting / b.excited
8. How far
9. When
10. Where
11. How much
12. How
13. Why
14. Who
15. What
16. Linh used to walk to school some years ago but now she cycles there.
17. There used to be many green trees in front of my house but now it is a big car park.
18. Despite working hard, she doesn’t get good results.
19. Despite the difficult exercise , she can do it easily.
20. Mary went to school yesterday despite her sickness