1 . 据说他们是从大陆游到那个岛的，但他们不可能做到，因为中间的海洋太宽了。
It’s said that they have swum to the island from the continent, but they ________________ it because the ocean in between is too wide.

2 . —I saw Lily in the teacher’s office just now.
—You _________ her, she has gone back home.

A．must not see

B．mustn’t have seen

C．can’t have seen

D．couldn’t see

3 . At the time we couldn't ________ (anticipate) the result of our campaigning. （所给词的适当形式填空）

4 . Without your help, I _________(complete) the task on time.

5 . George_________________(no, go不可能走)too far. His coffee is still warm.

6 . —Please let me know where David is. I couldn’t find him anywhere.
—Well, he _____have gone far—his coat’s still here.

A．shouldn’t

B．mustn’t

C．can’t

D．wouldn’t

7 . ----Have you heard of Wang Meng?
----Yeah. She ______ have done better. She won China’s first gold medal at Turin.

A．should

B．might

C．needn’t

D．couldn’t