1 . —The woman biologist had stayed in Africa studying wild animals for 13 years before she returned.
—Oh dear! She ________ a lot of difficulties!

A．may go through	B．must have gone through
C．should have gone through	D．might go through

2 . ——Tom is never late for work. Why is he absent today?
——Something ______ to him.

A．must happen	B．could happen
C．would have happened	D．must have happened

3 . —The woman biologist stayed in Africa studying wild animals for 13 years before she returned.
—Oh, dear! She ______ a lot of difficulties!

A．may go through	B．might go through
C．need have gone through	D．must have gone through

4 . Peter ________ just a moment ago. His coffee is still warm.

A．must have left	B．should have left
C．ought to have left	D．need have left

5 . I________ there so early because she didn't come until 10.

A．didn't need to get	B．couldn't have got
C．needn't have got	D．mustn't have got

6 . --Did they visit the famous university?
--No. They _______ it, but they spent too much time shopping.

A．must have visited

B．could have visited

C．can’t have visited

D．shouldn’t have visited

7 . Someone_________my umbrella.I found it wet.

A．should have used

B．can't have used

C．must have used

D．could have used

8 . Harry is feeling uncomfortable. He _______ too much at the party last night.

A．could drink	B．should drink
C．would have drunk	D．must have drunk

9 . Bob ______ his fortune; otherwise, he ______ from stress to pay back the loan.

A．must have made; wouldn’t have suffered

B．couldn’t have made; would have suffered

C．must have made; would have suffered

D．couldn’t have made; wouldn’t suffer

10 . She looks very happy. She_________ the exam.

A．can have passed

B．should have passed

C．must have passed

D．could have passed