Réponse:

21.1)

3. Glass is made from sand.

4. Stamps are sold in a post office.

5. This room is not used very often.

6. Are we allowed to park here?

7. How is this word pronounced?

8. The office was cleaned yesterday.

9. The house was painted last month.

10. My phone was stolen a few days ago.

11. Three people were injured in the accident.

12. When was this bridge built?

13. I was not waken up by the noise.

14. How was these widows broken?

15. Were you invited to Jon's party last week?

21.2)

1. This house was built

2. Football is played

3. Why was the letter send

4. A garage is a place where cars are repaired.

5. Where were you born?

6. How many languages do you speak

7. Somebody broke into oir house, but nothing was stolen.

8. When was the bicycle invented?