1 . —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

2 . The man over there _________ be Mr. Green. He has gone to New York on business.

A．may not

B．needn’t

C．can’t

D．mustn’t

3 . —Listen! Jack is playing the violin in the next room again.
—No, it ______ be him. He has gone to Shanghai on business.

A．must

B．can

C．can’t

D．mustn’t

4 . I know Sophia’s favourite star is a female singer, so it ________ be this actor.

A．may not

B．mustn’t

C．shouldn’t

D．can’t

5 . The loss of data (数据) ________ cause serious problems, so we’d better protect it from being stolen.

A．need

B．should

C．can

D．must

6 . —Listen! Who is knocking at the door?
—It ________ be Kate. She is dancing in her room now.

A．can’t

B．won’t

C．shouldn’t

7 . —Mr. Wang, is Cathy wearing a red coat in the classroom?
—It ________ be Cathy. She has gone to Hong Kong.

A．can

B．can’t

C．must

D．mustn’t

8 . The shoes ________ be Xiao Li’s. His feet are too small to wear them.

A．must

B．can’t

C．should

D．needn’t

9 . —Is that Alex running on the playground?
—It __________ be him. He is always in the library at this time.

A．can’t

B．mustn’t

C．needn’t

D．shouldn’t

10 . —David, is that man your headteacher?
—It _________ be him. He is the tallest in our school.

A．mustn’t

B．can’t

C．needn’t