2 . —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

3 . She ________have participated in the activity, for she was doing paperwork in the office then. (用适当的词填空)

4 . —You shouldn’t have talked back to our teacher like that.It was awfully impolite.
—You are right.I ________ crazy at that moment.

A．must have been	B．must be
C．could have been	D．should have been

5 . The spokesman did not regret what he had said at the conference but felt that he ________ it indirectly.

A．could express

B．would express

C．could have expressed

D．must have expressed

6 . The road is wet. It __________ have rained last night.

7 . These flowers have died. You _____________ have watered them.

8 . —I honestly don’t think I’m going to be admitted.
—Well, you never know! You ________ (make) a better impression than you think. (所给词的适当形式填空)

9 . Her round figure, seen in the Tang Dynasty, ________ the admirable image.

A．would have been considered	B．would have considered
C．had considered	D．must have been considered

10 . —John's gift? He ______a better one for me.
—He must be very happy to know it.

A．should have chosen	B．may have chosen
C．couldn't have chosen	D．needn't have chosen