1 . I must ________ (sound) very proud of myself after the quiz, saying how easy it was and how I was sure to get a good grade.(所给词的适当形式填空)

2 . He plays basketball very well. He_________ it a lot.

A．may practise	B．must practise
C．must have practised	D．should have practiced

3 . The lady ________ have done something wrong, because she is looking guilty.

A．would

B．should

C．can

D．must

4 . —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

5 . —Yao Yuan, a disabled woman, won the National Championships Cup last week.
—My goodness! She _______a lot of difficulties!

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

6 . 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