Exercie 8:
1. were caused
1. is made
2. will be included
3. is shown
4. is held
5. are employed
6. is covered
7. was damaged
8. were invited
Exercise 9:
1. The room is cleaned everyday
2. This road isn't used very often
3. The flights was cancelled because of fog
4. I was accused of stealing money
5. How are languages learned?
6. I was advised not to go out alone

Execise 14:
1. Mai asked Lan to give her a book
2. He asked Hoa if she liked music
3. He asked me what time I often went to school.
4. My teacher asked us not to tslk in class
5. He wanted no know if I had watched TV the night before
6. He asked me where I lived
7. He asked her if she had finished her homework
8. He wanted to know how many subjects I studied at school
9. She asked him to close the door
10. He said they would go to Da Lat the next day
Exercise 11:
17. When was the telephone invented?
18. How was the glass made?
19. When was Autraylia discovered?
20. Waht is silver used for?
21. When was the television invented?

Exercise 12:
1. speaks
2. drink
3. opens - closes
4. causes
5. live
6. doesn't drink
7. so the banks close
8. does Martin come
9. do you do
10. takes - does it take
11. play - don't play
12. does this word mean
13. goes - rises
14. don't eat
15. flows
16. comes
17. doesn't come
18. plays
19. promise
20. is - is
21. studies
22. misses