=>
III/
1. B -> happy
2. D -> himself
3. B -> enough money
4. C -> between
5. B -> because
6. A -> haven't
7. D -> read
8. D -> hasn't either
9. B -> x
10. A -> which
11. C -> built

IV/
1. Some of my books have been taken away.
2. The meeting will be held before the May Day.
3. The engine of the car has to be repaired.

4.  The window was broken and some pictures were taken away  by the boys.
5. A lot of money is spent on advertising everyday.
6. This room may be used for the classroom.
7. A story is going to be told by the teacher.
8. The cake is being cut uiwth a sharp knife by Mary.
9. The wowmen with a red hat were looked at by the children.
10. Badminton used to be played by her when she was young.

V/
1. assistant
2. arrangement
3. owners
4. inventor
5. invited
6. broken
7. useful
8. northern
9. disappeared
10. advertisement

VI/
1. Because it rained heavily, we were late for school.
2. Do I have to clean this table?
3. It's dangerous to ride a bicycle so fast.
4. My family used to live in Hai Phong.
5. We didn't arrive early enough to see the first film.
6. The water was too cold for the children to swim in.
7. The doctor told Nam to eat more and more vegetables.
8. No one in the team can play better than Tom.
9. Peter said "I am not feeling well now."
10. Tea is warm enough for me to drink.
11. I was made to study harder in the second semester by my father.

12. He is not old enough to ride a motorbike.
13. It's such an expensive car that I can't buy it.