John was sacked last year. He.... harder.
A.may have worked
B.should have worked
C.must have worked
D.should be working

When you have a small child in the house, you.... leave small objects lying around.
A.may not
B.should not
C.needn’t
D.ought to

John.... drive when he was eighteen.
A.cannot
B.could not
C.would rather
D.might not

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