I ______ have been more than six years old when the accident happened.
A. shouldn’t B. couldn’t C. mustn’t D. needn’t
— Is John coming by train?
— He should, but he ______ not. He likes driving his car.
A. must B. can C. need D. may
You _____ phone him if you want to, but you _____! He will surely phone you.
A. may; mustn’t B. have to; needn’t C. can; needn’t D. can; doesn’t need
My aunt _____ here by now, for she took the early bus.
A. must arrive B. can arrive C. may arrive D. ought to have arrived
The pilot kept calm in the terrible storm, otherwise the accident ______.
A. couldn’t be prevented
B. mustn’t have prevented
C. wouldn’t have been prevented
D. shouldn’t prevent
You _____ pay your library fines. If not, you _____ not be allowed to graduate.
A. may; should B. should; need C. must; will D. will; can
