1 . -----Someone is knocking at the door.It ____ be Tom .
-----No, it ______ be him ;he has gone to Sydney.

A．must, can’t	B．might, mustn’t
C．may, needn’t	D．can, mustn’t

2 . Now that the sign reads, “No person ______ smoke here”, please choose a seat in the smoking area over there if you _______ smoke.

A．must; shall

B．will; must

C．shall; must

D．can; should