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.

3 . 用方框内短语的适当形式填空

can，could，may，might，must

1. Helen ________ go on a trip with us, but she isn’t quite sure.
2. My sister met him at the theatre last night, so he ________ have attended your lecture.
3. —I am sure I saw Brian in the park this morning.
—You ________ be imagining things. He left for America last night.
4. —Is John coming by bus?
—He should, but he ________. He likes riding his bike.
5. —Isn’t that your teacher over there?
—No, it ________ be him. I’m sure he doesn’t wear glasses.

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

6 . ----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