=>
5. to see
6. collect
7. going
8. keep
9. are doing
10. would buy

IV/
3. Because she is poor, she can't go to school.
4. If her mother weren't sick, she would go to the movies.
5. If you don't work carefully, you won't get good marks.
6. The last time we met our friends was 10 years ago.
7. The woman whose car we borrowed last week is very kind.
8. Miss Hoa, who lives next to my house, plays guitars well.
9. Rice is grown in the tropical countries.
10. Their work has been finished since yesterday.
11. The problem can be solved.
12. They are building a new bridge in this village.
13. Though we are very busy, we still visit our uncle.
14. Is that machine which she bought yesterday?
15. Hong is younger than Lan.

16. I asked Hung what he was going to do then.
17. This examiner asked Hoa why she liked to learn that subject.
18. Despite the bad weather, we couldn't go camping.
19. If it rains, we will stay at home.
20. It's two years since they last talked to each other.
It's been two years since they talked to each other.

TEST 2/
I/
1. predict
2. central
3. eruption 
4. Hopefully
5. carefully
6. polluted
7. joyful
8. sightseeings
9. disappointed
10. freedom
11. volcanic
12. natural
13. experience
14. trusts