1 . Harry is feeling uncomfortable. He _______ too much at the party last night.

A．could drink	B．should drink
C．would have drunk	D．must have drunk

2 . Paul did a great job in the speech contest. He many times last week.

A．need have practised	B．might practise
C．must have practised	D．could practise

3 . Someone ____the tap on, for the water was running over and flooding the bathroom.

A．could leave

B．must have left

C．might leave

D．should have left

4 . —She looks very happy. She ____have passed the exam.
—I guess so. It’s not difficult after all.

A．should

B．could

C．might

D．must

5 . Since nobody gave him any help, he ______ have done the research on his own．

A．can

B．must

C．would

D．need