Ответ:
1. Emails are sent.
2. The grass is cut.
3. Cars are often stolen.
4. Loud music is played.
5. The rooms were cleaned.
6. The computer was fixed.
7. That house was built.
8. "War and Peace" was written.
9. A new book will be written.
10. A stadium will be built.
11. Your luggage will be collected.
12. The plan will be explained.