According to the school regulations, you ____ make a noise in the test room.
A. mustn't
B. may not
C. needn't
D. don't have to
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Mike ____ jump higher when he was young.
A. should
B. would
C. could
D. might
He was once a fire fighter in the army, so he ____ use the fire extinguisher skillfully when the fire broke out.
A. was able to
B. could
C. might
D. succeeded to
According to the contract, the buyer ____ arrange shipment of the goods.
A. may
B. can
C. shall
D. would
Whenever I had some difficulties in my study, I ____ turn to Steve for help.
A. will
B. shall
C. should
D. would