Here are the sentences transformed into passive voice:

1. The windows were broken by the boys.
2. Nam’s wallet was stolen by someone.
3. A new hat was bought by her last night.
4. His story is not believed by anyone.
5. The book was written many years ago by them.
6. The news is reported by Peter every day.
7. These trees are watered by my father every morning.
8. The fridge was moved into the living room by them.
9. This work was started by him last month.
10. A new marketing manager has been appointed by us.
11. A lot of money is spent on advertising by people nowadays.
12. Her ticket was shown to the airline agent by her.
13. The broken cup was hidden in the drawer by him.