Even students of average intelligence ________ become top students by improving their study habits.

A．must? B．can

C．have to? D．ought to

—Look，I’ve bought some bread，including your favorite flavor.

—You ________ any because we still have plenty at home.

A．should have bought

B．could have bought

C．needn’t have bought

D．mustn’t have bought

It is beyond my understanding that many adults ________ be so crazy about Harry Potter series.

A．will? B．can

C．may? D．should

It’s a pity that Andrew didn’t want to go to the conference.________ willing to go，we could have paid all his expenses.

A．Had he been? B．Being

C．Was he? D．He had been

These days some young people just ________ work hard because they have got used to the easy life provided by their parents.

A．mustn’t? B．won’t

C．mightn’t? D．shouldn’t

—I regret to say that I failed to rank first in the terminal exam.

—Come on，nobody ________ win all the time.

A．should? B．must

C．shall? D．can

—May I take this book out of the reading room?

—No，you ________.You read it in here.

A．mightn’t? B．won’t

C．needn’t? D．mustn’t

Sorry，Cathy，I didn’t know that you were badly short of money then.But you ________ me for help.

A．must have asked

B．could have asked

C．would have asked

D．may have asked

—I called you at 9 last night，but no one answered.

—Sorry，I ________ sleeping.I went to bed very early.

A．need have been? B．would have been

C．must have been? D．should have been

I’m as busy as a bee；________ you bother me with so many questions now?

A．may? B．must

C．can? D．shall