1 . —Life ____ be very hard for people living in the north of Canada as it is very cold there in winter.
—Yes, the weather there _____ be as low as 60℃ below zero.

A．must; can

B．shall; must

C．will; should

D．has to; can

2 . If it were not for the fact that she ________ sing, I would invite her to the party.

A．couldn’t	B．shouldn’t
C．can’t	D．shan’t

3 . Look! There’s no light on—Sara _____be at home.

A．can’t

B．mustn’t

C．needn’t

D．shouldn’t