用括号内所给动词的适当形式填空。1. If you _________ (not be) careful enough when crossing the ro

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用括号内所给动词的适当形式填空。1. If you _________ (not be) careful enough when crossing the road, a car may hit you.
2. By the time he got home, his wife _________ (do) all the housework.
3. In the United States, lunch _________ (offer) to students for free at school.
4. The first step towards _________ (protect) the environment is to live a "low-carbon" lifestyle.
5. The day all the American basketball fans looked forward to _________ (come) at last.
6. While I _________ (sweep) the floor yesterday, the telephone rang.
7. Jack told me that they _________ to the USA from Shanghai by the end of next November. (return)
8. The disabled mustn"t _________ (laugh) at by anybody.
9. The audience are required _________ (show) their tickets when they enter the cinema.
10. They _________ (eat) up all the food, but they still feel hungry.

答案

1. aren"t  2. had done  3. is offered  4. protecting  5. came
6. was sweeping  7. would return  8. be laughed  9. to show  10. have eaten