She…. that it is a good idea. It is crazy!
A.can’t think
B.must think
C.may have thought
D.could think

.... I use your car? - Of course. Here’s the key.
A.May
B.Must
C.Need
D.Should

I.... you stayed with me during the summer.
A.could
B.may
C.must
D.would rather

I know what you mean. You________explain further.
A.won’t
B.mightn’t
C.needn’t
D.mustn’t

Hiking the trail to the peak.... be dangerous if you are not well prepared for dramatic weather changes.
A.shall
B.should
C.might
D.had better

She…. a lot after his husband’s accident. That was why her eyes were so red and swollen.
A.must be crying
B.can have cried
C.must have cried
D.will have cried

It…. Sam who called and did not leave a message on the answering machine. I am not sure.
A.must be
B.might be
C.must have been
D.might have been

If Daisy has not come home yet, she…. for us at the school gate.
A.can’t be waiting
B.would be waiting
C.must still be waiting
D.will be waiting

You can’t mean that! You…. .
A.must be joking
B.can be joking
C.can joke
D.have to joke

You…. book the tickets for the play in advance because they sell out quickly.
A.could
B.mustn't
C.have to
D.may