Change these sentences into passive voice:
1. Beer wasn't drunk at the party yesterday.
2. A new house has been bought by Mary for two weeks.
3. Two oranges are eaten by my mother every day.
4. How many languages are spoken by them?
5. A letter is written to his pen pal by him once a month.
6. This kind of novel hasn't been read by me before.
7. Is breakfast often eaten by you at home?
8. How much sugar was bought by your mother yesterday?
9. My friend's house is going to be painted by him tomorrow.
10. These poems have been completed by my son early.