1 . 她断定他准是把包落在火车上了。
She reasoned that she ________________ on the train.

2 . Something ________ have happened to Mary—She’s been crying all morning. (Possibility) (用适当的词填空)

3 . He __________________________ as he heard the story.   
当他听到这个故事时，肯定（气）疯了。

4 . Look at his strong muscles now! He ________ worked out regularly over the past year.

A．could have

B．should have

C．might have

D．must have

6 . You haven’t gone anywhere today. You ________ your bag in the office.

A．could have left	B．must have left
C．could leave	D．must leave

7 . There was no sign of a break-in, so the thieves ________ someone on the inside helping them.

A．must have had	B．could have had
C．needn’t have had	D．might have

8 . Paul did a great job in the speech contest. He must ________(practise)many times last week. （所给词的适当形式填空）

10 . — Mary's score on the test is the highest in her class.
— Really? She ________ have studied very hard. （用适当的词填空）