1 . I can’t find my wallet now. I________ it in the bus just now, but I’m not sure.

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

2 . During our trip to the Great Wall last week, I couldn’t stop thinking about how huge a project it ________ have been to build it in ancient times.

A．must

B．could

C．should

D．need

3 . They________ have completed their program ; or they wouldn’t be enjoying themselves by the seaside.

A．should

B．must

C．wouldn’t

D．can’t

4 . —Celia looks so upset. She ________ the driving test.
—It is the second time that she has failed in the test.

A．can’t pass

B．can’t have passed

C．mustn’t pass

D．mustn’t have passed

5 . The children____________ very excited as they received the handwritten letter from Father Christmas.

A．may be

B．should be

C．must have been

D．could have been

6 . —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

8 . George ______ too far. His tea is still warm.

A．should have gone

B．can’t have gone

C．might have gone

D．needn’t have gone

10 . I ______ have cooked so much food. Nobody was hungry and there were a lot of leftovers.

A．needn’t

B．wouldn’t

C．mustn’t

D．couldn’t