Rewrite the sentences in passive voice.

1. They understand Spanish.
2. They developed a new kind of washing powder.
3. The lady gave me the keys.
4. The policemen help the children.
5. They sing the song very well.
6. Postman delivers letters at 8 everyday.
7. My parents gave me some pocket money.
8. She sent information to Ann.
9. They grow coffee in Kenia.