20. We saw some boys playing football behind the house.

　　　　　　　 Some boys _____ _____ _____ football behind the house.

　　　　　　　 △ 提 高 型

19. The boss made the workers work all day.]

　　　　　　　 The workers _____ _____ _____ work all day (by the boss).

18. I’ll buy my daughter a new watch.

　　　　　　　 A new watch will _____ _____ _____ my daughter.

17. You can look up the word in the dictionary.

　　　　　　　 The word can _____ _____ _____ in the dictionary.

16. He doesn’t clean the meeting-room every day. (1999兰州)

　　　　　　　 The meeting-room _____ _____ every day.

15. Someone took away the boxes yesterday. (1999甘肃)

　　　　　　　 The boxes _____ _____ away by someone yesterday.

14. Mike drew a picture on the blackboard. (1999四川)

　　　　　　　 A picture _____ _____ on the blackboard by Mike.

13. Many people speak French in China. (1999广西)

　　　　　　　 French _____ _____ by many people in China.

12. The foreigners can’t understand this word. (1999广东)

　　　　　　　 This word can’t _____ _____ by the foreigners.

11. You must send your sister to hospital at once. (1999山东荷泽)

　　　　　　　 She must _____ _____ to hospital at once.