1. It was left here by someone.
2. 100000 babies are born...
3. The cake was cut with a big knife.
4. A book by Tolstoy was read by her.
5. Mistakes were made...
6. The pyramids were built...
7. Why aren't the exercises finished?
8. They were told to wait here.
9. She was not helped by anyone.
10. The teacher is always surprised by her answers.