Chuyển câu bị động:
13. The broken cup is hidden in the drawer (by him).
14. This room is kept tidy (by them) all the time.
15. The party was all voted a great success.
16. An was given some bananas and some flowers (by us).
Or: Some bananas and some flowers were given to An (by us).
17. The fridge was moved into the living room (by them).
18. Some cups of tea were bought to the visitors in the next room.
Or: The visitors in the next room were bought some cups of tea (by her).
19. The new project is found worthless.
20. The note wasn't taken to the manager by the secretary.
21. The wine should be opened about three hours before you use it.
22. Nails must not be hammered into the walls without permission.
23. Bicycles must not be left in the hall.
24. Books can be kept by members for three weeks.
25. Their complaints should be sent to the main office.
26. Al the switches must be turned off before leaving the room.
