1 . The ground is rather wet, so it ______(rain) last night. （所给词的适当形式填空）

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 . I have lost my wallet. I ________ it somewhere just now.

A．must drop	B．must have been dropped
C．must have dropped	D．should have dropped

5 . There was no one else in the classroom, so he ______ it by himself.

A．should have done

B．need have done

C．must have done

D．could have done

6 . 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

7 . 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

8 . It ________ (rain) last night, for the ground is wet. (所给词的适当形式填空)

9 . 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

10 . The room is so clean. It must have________yesterday evening.

A．cleaned

B．not clean

C．been cleaned

D．be cleaned