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

He was suspected of giving away government secrets to the enemy. They have investigated him for days.
A.Suspecting of giving away government secrets to the enemy, he has investigated them for days.
B.Having suspected of giving away government secrets to the enemy, he has investigated them for days.
C.He had been investigated for days, suspected of giving away government secrets to the enemy.
D. Suspected of giving away government secrets to the enemy, he has been investigated for days.

Travellers are advised to take out insurance. Their luggage may go astray.
A.Travellers should take out insurance if their luggage goes astray.
B.Travellers should get insurance, or else their luggage may go astray.
C.Travellers are advised to take out insurance in case their luggage goes astray.
D.Travellers had better buy insurance as a precaution against their luggage go astray.

You …. the air pressure in your tires if you do not want to get a flat tire on your trip.
A.should be checked
B. do not have to check
C.mustn’t check
D.ought to check

The computer does not work. It…. during transportation.
A.must have been damaged
B.should have been damaged
C.can be damaging
D.will damage