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1. He is said to sleep on a bed of nails.
2. The troops were reported to be coming.

3. Đúng

4. It is in autumn that the countryside is most beautiful.
5. The man who used to be very rich is selling lottery tickets.

6. The Great Wall is said to have been built in the Tan dynasty.
7. He is said to have been the first prize winner in lottery.
8. It was what I saw at the dance party that surprised me. 
9. Was it Thomas Edison who invented the telephone?
10. didn't they

11. won't you
12. does it
13. You were known to be in town on the night of the crime.
14. This house is thought to have been built in 19th century.
15. It used to be believed that the earth was flat.