1. The children are helped (by the police).
2. The flowers are watered (by mother).
3. The song is sung very well (by them).
4. The letters are delievered (by postman) at 8 a.m.
5. These cars are made in Japan (by them).
6. Our window was smashed last night.
7. Some pocket money were given me (by my parents).
8. Band news were told to her (by them).
9. Information was sent to Ann (from her).
10. A new chance was given them (from him).
11. The coffe is grown in Kenia.
12. The bridge was built by the romans 2.000 years ago.
13. Some houses were damaged by the thunderstorm.

PS: То, что в скобках, лучше не писать.