5. C
6. B
7. D
8. C
9. B
10. A
11. D
12. C
13. A
14. A/ B
16. A
19. A
20. B
21. A
III.
25. what (-> which)
26. working (-> work)
27. use for (-> is used for)
28. are being built (-> is being built)
29. who (-> whom)
IV.
1. Another man-made satellite has been sent up in to space.
2. Thousands of animals have been killed in the forest fire lately.
4. Mike has been offered an oppoturnity to study abroad.
5. The house at the end of the street has been sold last month.
6. I have never been to Ho Chi Minh city before.
7. Alice has already made a birthday cake for Peter.
8. How many times have you seen that film?