1 . —Sir, you ________ use your mobile phone at the gas station. It’s very dangerous.
—Sorry, I won’t.

A．mustn’t

B．may not

C．needn’t

D．don’t have to

2 . You ________ take the book out of the reading room. You can only read here.

A．needn’t

B．mustn’t

C．shouldn’t

D．couldn’t

3 . People in the closed areas (封控区) ________ get out of their houses except for emergency.

A．mustn’t

B．can’t

C．shouldn’t

D．oughtn’t

4 . —Keep quiet! Our English teacher, Mr. Lin is coming.
—Don’t worry. It ________be him. Mr. Lin is much thinner.

A．mustn’t

B．can’t

C．must

D．might

5 . When the traffic light is red, we ________ walk on.

A．mustn’t

B．needn’t

C．couldn’t

6 . People ________ talk loudly in the library. It’s the rule!

A．should

B．mustn’t

C．can

D．needn’t

7 . —Sir, may I take photos here?
—Sorry, look at the sign. You ________ take photos in the museum.

A．shouldn’t

B．needn’t

C．mustn’t

8 . —I found a wallet on the floor this morning. Is it yours?
—No, it ________ be mine. Mine is at home.

A．can’t

B．mustn’t

C．needn’t

9 . According to (根据) the traffic rules, children under 12 ________ ride a bike on the road.

A．needn’t

B．mustn’t

C．can’t

10 . —Can I swim here?
—I am sorry, children ________ swim alone here.

A．needn’t

B．may not

C．mustn’t

D．won’t