Hola, necesito estas respuesta por favor ayud Quick Exercise

Put the following sentences into passive voice. (simple past)

1. Who wrote this book?
Who was this book written by
?
2. How did they steal her car?
?
3. The children rang the bell a few minutes ago.
.
4. The kids forgot the whole story in a few days.
.
5. Did the president make an important speech last night?
?
6. The police didn't question him very closely.
.
7. The wild animals killed two men yesterday.
?