1 . Children under twelve ________ ride bicycles on the road. It’s dangerous.

A．needn’t

B．mustn’t

C．wouldn’t

2 . —May I bring my smartphone to the class, Mr. Lin?
—No, you _________. Students are not allowed to do it.

A．won’t

B．mustn’t

C．needn’t

D．shouldn’t

3 . In China, you _________ drive after drinking, or you will be against the law (违反法律).

A．shouldn’t

B．mustn’t

C．wouldn’t

D．couldn’t

4 . —_______ I swim here?
—I’m sorry. Children _______ swim alone here because of danger.

A．Must, can’t

B．May, must

C．Can, mustn’t

5 . Can you see the sign on the wall? We ________ smoke here.

A．needn’t

B．need

C．mustn’t

D．must

6 . According to the new traffic rules, people ________ ride e-bikes unless they wear helmets.

A．may

B．must

C．mustn’t

D．may not

7 . Don’t you see the sign “No photos”? You _______ take photos here.

A．mustn’t

B．needn’t

C．won’t

8 . According to the traffic rules, children under the age of sixteen ________ e-bikes on the road.

A．mustn’t

B．needn’t

C．may not

D．might not

9 . —Mr Li, must I finish my report today?
—No, you ________. You may hand in it tomorrow.

A．mustn’t

B．can’t

C．couldn’t

D．needn’t

10 . According to the local rule, children under the age of 12 ________ ride a shared bicycle.

A．can’t

B．needn’t

C．mustn’t

D．may not