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 . You ________ have seen Mary at the meeting this morning, because she left for Beijing yesterday. (用适当的词填空)

3 . It’s said that they have swum to the island from the continent, but they ________ (不可能做到) because the ocean in between is too wide. (do) (根据汉语提示完成句子)

4 . Mary ________ my letter; otherwise she would have replied before now.

A．couldn’t have received	B．ought to have received
C．needn’t have received	D．shouldn’t have received

5 . With the loss of blood, he couldn’t __________ (survive) for very long after being shot. (所给词的适当形式填空)

6 . She   ________   have attended that meeting, for she was doing paperwork in the office then. (用适当的情态动词填空)

7 . You couldn’t have d______ Jimmy out of New York: he thought it was the only place on earth．
可你没法把吉米拖出纽约，他觉得地球上只有纽约这么一个地方。

8 . I dare ________ that without your help, we ________ so much progress in our work.

A．say; can’t make	B．to say; couldn’t make
C．say; couldn’t have made	D．to say; shouldn’t have made

9 . It ______ last night, as the ground is still wet.

A．may have rained

B．must rain

C．can’t have rained

D．must have rained

10 . I didn’t see Fred in the library this morning. He_____have borrowed that book.

A．mustn’t

B．shouldn’t

C．couldn’t

D．needn’t