1 . If you leave within 15 minutes, you________ park your car at the roadside temporarily.

A．would	B．should
C．must	D．can

2 . Hang a wet towel in your hotel room — because of climate-controlled rooms and windows that don’t open, the air _________ be very dry.

A．must	B．can
C．shall	D．need

3 . According to the school rule, no child            be allowed out of the school, unless accompanied by his or her own parents.

A．should	B．must
C．shall	D．can

4 . —How’s your new English teacher?
—We _____ ask for a better one. All my classmates love her so much.

A．mustn’t	B．couldn’t
C．shouldn’t	D．needn’t

5 . There       a slight decrease in his weight but he eats too much.

A．was	B．could have been
C．had been	D．could be

6 . 一I think I saw Mr. Smith at yesterday's party.
一He ______ there. He is now on a business trip in Greece. And he left the day before yesterday.

A．mustn't have been	B．couldn't have been
C．might not be	D．should not be

7 . A recent study shows that being pulled into the world of a fascinating novel ______ make some actual, measurable changes in the brain.

A．can

B．need

C．shall

D．should

8 . Anyone ________ be a victim of road accidents if he doesn’t observe traffic regulations.

A．can	B．must
C．should	D．shall

9 . —What do you think of Peter?
—He ______ be really difficult to get along with even though he’s a nice person in general.

A．shall	B．should
C．must	D．can

10 . The sportsman ________save a drowning boy that afternoon; the boy’s parents appreciated him very much.

A．might	B．could
C．was able to	D．must