20. Active to passive. Put the following into the passive voice.
1. You should open the wine about three hours before you use it.
2. Previous climbers had cut steps in the ice.
3. Somebody had cleaned my shoes and brushed my suit.
4. We use this room only on special occasions.
5. You must not hammer nails into the walls without permission.
6. Someone switched on a light and opened the door.
7. Somebody had slashed the picture with a knife.
8. They are pulling down the old theatre.
9. Why didn't they mend the roof before it fell in?
10. The police asked each of us about his movements on the night of the crime.
11. Someone will serve refreshments.
12. People must not leave bicycles in the hall.
13. Members may keep books for three weeks. After that they must return them.
14. The burglars had cut an enormous hole in the steel door.
15. I've bought a harp. They are delivering it this afternoon. (Do not change the first sentence.)
16. Someone has already told him to report for duty at six.
17. They rang the church bells as a flood warning.
18. No one can do anything unless someone gives us more information.
19. People are spending far more money on food now than they spent ten years ago.
20. The organizers will exhibit the paintings till the end of the month.
21. They will say nothing more about the matter if someone returns the stolen gun.
22. It is high time someone told him to stop behaving like a child.
23. A thief stole my dog and brought him back only when I offered £20 reward for him.
24. The judge gave him two weeks in which to pay the fine.
25. They make these artificial flowers of silk.