1 . ----- Mary looks very upset. She _______ failed to pass the exam.
----- I guess so. It's very difficult after all.

A．must have

B．could have

C．should have

D．might have

2 . He _____ have finished his work; otherwise, he wouldn’t be enjoying himself by the seaside.

A．should

B．must

C．need

D．can

3 .    When I suggested that someone in the village ____ his wine, he didn’t believe.

A．must have drunk

B．should drink

C．have drunk

D．has drunk

4 . Their answers are exactly the same. One of them ___ from the other.

A．must copy

B．must have copied

C．should copy

D．should have copied

5 . “I called you yesterday. A woman answered, but I didn’t recognize her voice.” “Oh, it _____ my aunt Jean.”

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

6 . I didn’t hear the phone．I ______ asleep．

A．can be

B．must have been

C．must be

D．should have been

7 . ------ Tom is never late for work. Why is he absent today?
------ Something _________ to him.

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