3 . —Would you like to go swimming with me this afternoon?
—I’d love to. But I’ m afraid I________. I have too much work to do.

A．can’t

B．mustn’t

C．needn’t

D．may not

4 . Sometimes it seems that doors ___________ be closed for you, but remember, they are not all locked.

A．must

B．should

C．may

D．need

5 . —Is Robert coming by coach?
—He should, but he ___________ not. He likes driving his car.

A．may

B．could

C．need

D．must

6 . You ______ feel all the training a waste of time, but I'm a hundred percent sure later you'll be grateful you did it.

A．may

B．can

C．should

D．would

7 . －Will you go travelling with me this summer?
－I'm not sure. I ________ have to take care of my grandma.

A．may	B．shall
C．need	D．must

8 . Some people who don’t like to talk much are not necessarily shy; they __________ just be quiet people.

A．must	B．might
C．should	D．would

9 . There is great chance that the patient suffering from cancer____ survive with medical advances.

A．must

B．need

C．might

D．should

10 . —Excuse me. Is this the right way to the Summer Palace?
—Sorry, I am not sure, but it ____________ be.

A．might	B．need
C．must	D．should