Put the following sentences into passive voice

put the following sentences into passive voice
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EXERCISES 1: Put the following sentences into passive voice:
1. John wrote this letter.
2. His friend will deliver that letter.
3. He had found the key before they arrived.
4. He hasn't prepared his lesson yet.
5. They didn't leave the report here.
6. We must warn them of danger.
7. People can't hold the meeting in that room.
8. You should follow your father's advice.
9. He is doing his exercises carefully.
10. My mother told us an interesting story.
11.They bought her a present on her birthday.
12.Mary teaches them English.
13.They asked me many difficult questions.
14 Does John return the book he borrowed yesterday?
15,Have you met him before?
16.Don't they send the letter?
17.How did you carry it home?
18.Find all the books you need.
19. We heard him come in.
20.He let her go.
21.People said that he had gone.
22.People think that he is a famous doctor.
23.It's time someone told him what is wrong.
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24. Tom hates people looking at him.
25.Don't let the others laugh at you!
26.I'd love someone to take the children out for a walk.
27.Ann gave the boy a ticket and led him to the theatre.
28.Nobody has used this room for ages.
29.It is your duty to make tea.
30.He likes people to call him "Sir".
31.It was impossible to do this.
32. Water covers the school yard.