1 . It ___________ last night, for the road was very muddy.

A．would have rained

B．must have rained

C．should have rained

D．must rain

2 . －She looks very happy. She ___________the exam.
－I guess so. It's not difficult after all.

A．should pass	B．can pass
C．must have passed	D．might have passed

3 . You _____ something great, otherwise you wouldn’t have got the promotion.

A．should do	B．must do
C．should have done	D．must have done

4 . --- It was a relief when the kids were found.
--- Yeah. Their parents _____ have been very worried while they were lost.

A．need	B．should
C．must	D．might

5 . My phone ________ have been stolen while I was taking a bus. I can’t find it anywhere.

A．can	B．must
C．should	D．would

6 . －When I first got to Harvard, my terrible English was a burden to me.
－Oh, dear, it ________ a struggle for you to keep up with other students.

A．might be	B．can be
C．should have been	D．must have been

7 . —It’s amazing that Beijing and Zhangjiakou have won the bid for the 2022 Winter Olympics!
—Sure it is! The government ________ have made great efforts!

A．could	B．should
C．might	D．must

8 . Tom looks very happy. He _____ have passed the interview.

A．can

B．must

C．may

D．might

9 . —I phoned you yesterday morning. A girl answered, but I didn’t recognize the voice.
—Oh, it ________ my younger sister. She was in my room at that moment.

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