Составить предложения в Passive

1. All the books were put by our father in the bookcase.
2. All homework has already been handed in by us.
3. All the preparations haven't been finished by them yet.
4. A cup of coffee has just been drunk with him.
5. The letter has already been typed by the secretary.
6. All my bills have just been paid.
7. My skates haven't been brought by them yet.
8. All the flowers in the garden have already been planted by us.