1 . Look, the ground is white! It must __________(snow) last night. (所给词的适当形式填空)

2 . Mary’s bedroom is so tidy. She ________ have cleaned it last night.

A．can

B．need

C．must

D．should

3 . I________ there so early because she didn't come until 10.

A．didn't need to get	B．couldn't have got
C．needn't have got	D．mustn't have got

4 . Something terrible ________ （一定发生了）if Li Chang was not coming to eat in his restaurant as he always did.（根据汉语意思完成句子）

5 . The construction of the laboratory_________ by the end of July.

A．must be completing

B．must complete

C．must have completed

D．must have been completed

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

A．must be	B．must have been
C．should be	D．should have been

7 . His work _________ have been completed; otherwise, he wouldn't be enjoying himself on the beach.

A．should

B．must

C．can't

D．shouldn't

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

A．can be

B．must have been

C．must be

D．should have been