1 . We ________ last night, but we went to the cinema instead.

A．must have studied

B．might study

C．should have studied

D．would study

2 . —They haven’t finished the work up to now.
—Well, they ________.

A．should have

B．should

C．ought to

D．ought have

3 . Jean ________ have kept his promise. I wonder why he changed his idea.

A．must

B．should

C．need

D．would

4 . —Sorry, Mr. Smith. I didn't finish ________ assignment you gave me last week.
—Oh, you ________ have done it as yesterday was the deadline.

A．an, may

B．the; could

C．an; must

D．the; should

5 . They   ________have arrived at lunchtime but their flight was put off.

A．will

B．can

C．must

D．should

6 . Sir, you should ________ at the red light, but you didn’t.

A．stop	B．have to stop
C．have stopped	D．not have stopped