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III/
1.  She is said to work 16 hours a day.
2. The prisoner is thought to have escaped by climbing over a wall.
3. Do they teach Mathematics in this school?
4. A story is going to be told by the teacher.
5. The classroom was being cleaned when I came.
6. More and more pollution is being produced by this factory.
7. Did Tom send the letters?
8. The cheque hasn't been signed.
9. His story isn't believed.
10. Is English taught in your school?
11. Mr.John opened this store in 1990.
12. The students are writing the lessons.
13. My room was broken into and some pictures were taken away.
14. He will be sent a gift on his birthday.
16. English is known to be an international language.
18. He was declared to have died in a natural death.
19. 13 is believed to be an unhappy number.
20. People said that the owner of the house had gone abroad.

Bài 4 tạo thành một câu hỏi mới nhé.