1 . Look, double yellow lines! You        park here.

A．wouldn’t

B．mustn’t

C．needn’t

D．daren’t

2 . There’s a public sign in the library, saying no person ________ bring food and drinks into the reading room.

A．shall

B．will

C．need

D．must

3 . —I can’t get through to the general manager’s office anyhow.
—The line is busy. Someone________ the telephone.

A．can use

B．can have used

C．must have used

D．must be using

4 . —Can I smoke here?
—No. Go to the smoking section, if you ____.

A．must

B．can

C．shall

D．may

5 . Looking people in the eye ______ sometimes make them nervous and embarrassed.

A．must

B．can

C．should

D．might

6 . —— I can’t get through to the general manager’s office anyhow.
—— The line is busy. Someone _____ the telephone.

A．must use

B．uses

C．must have been using

D．must be using