1 . —Look! Mark is reading a book in the library.
—It ________ be him. He is in the classroom.

A．can’t

B．needn’t

C．mustn’t

2 . Brian is running so fast. I ________ believe my eyes.

A．shouldn’t

B．needn’t

C．mustn’t

D．can’t

3 . —Where is our headmaster?
—I don’t know. But she ________ be at the office. The door is locked.

A．needn’t

B．can’t

C．mustn’t

4 . She walked here today, so this bike ________ be hers.

A．can

B．mustn’t

C．can’t

D．must

5 . That girl ________ be Sandy. She is in Shanghai on business now.

A．mustn’t

B．can’t

C．may

D．should

6 . —I ________ find my keys.
—Have you checked in your jacket pocket?

A．mustn’t

B．can’t

C．needn’t

D．won’t

7 . —Who is the boy running on the playground? Is it Jordan?
—It ______ be him. I saw him in the classroom just now.

A．mustn’t

B．needn’t

C．can’t

8 . —________ I add some sugar to it?
—Of course. It’s up to your taste.

A．Must

B．Should

C．Will

D．Can

9 . —Look! The man at the gate __________ be our headmaster. He almost stands there every morning.
—No, it _________ be him. He is holding a meeting in the office now.

A．can; can’t

B．must; mustn’t

C．must; can’t

D．might; mustn’t

10 . She can make zongzi.（改为一般疑问句）
________ she ________ zongzi?