=>
5. My father used to play piano with his friends at night.
6. The thief is thought to have got in through the bathroom window.
7. That's the girl whose mother used to work with mine.
8. They asked him what he would do to help his mother.
9. I would rather you delivered the sofa on Friday.
10. Because he is very kind, all the students love the principal.
VII/
1. B -> rang
2. C -> an
3. A -> reducing
4. D -> polluted
5. B -> to
6. A-> had
7. D -> go home
8. A -> was told