1 . There was no one else in the classroom, so he ______ it by himself.

A．should have done

B．need have done

C．must have done

D．could have done

2 . “What?!” I tried to turn on my brain but the engine just wouldn’t start.
(Please describe the situation when you couldn’t find your key in front of the door.) (按要求仿写)
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3 . Judging from the way he’s laughing and chatting with people, Tom ______ the game.

A．needn’t have won

B．couldn’t have won

C．must have won

D．would have won

4 . They _____________________(一定意识到) that we were totally helpless, for after a few moments, they wandered over and pushed us free. (根据汉语提示完成句子)

7 . It ___________________ last night, for the ground is still wet.
昨晚一定下雨了, 因为地面还是湿的。

9 . The ground is covered with water. It must have rained last night. （英译汉）
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