1 . Social media platforms make different voices heard, but they ______ also spread false information.

A．must

B．can

C．should

D．need

2 . This road is narrow and the traffic on it is heavy, so sometimes it ______ be blocked.

A．should

B．shall

C．can

D．need

3 . In science, facts should be proved by experiments and research, and we ______ always believe everything we read and hear -- even if it is a great story.

A．can not

B．may not

C．must not

D．should not

4 . If someone happens to have high fever and pneumonia, he or she _________ seek treatment fast.

A．must

B．needs

C．may

D．could

5 . —Do we have to take some warm clothes?
—Yes, we had better. It ________be cold in the mountain at night.

A．may

B．would

C．can

D．should

6 . —________ you make a little less noise please? I’m trying to work.
—Oh. sorry.

A．Must

B．Need

C．Should

D．Can

7 . —Mom,_____I hang out with Susan now?
—No,you_____.It’s dangerous for two girls to be outside at night.

A．could;can’t

B．could;needn’t

C．should;can’t

D．must;couldn’t

8 . There is always a lot of traffic at this time of day. So I ________ arrive a bit late.

A．might

B．can

C．needn’t

D．mustn’t

9 . — Why don’t you enter the office? They are waiting for you.
— The door ________ open, no matter how hard I pushed.

A．won’t

B．can’t

C．mustn’t

D．needn’t

10 . Didn't she notice they were crying there? How ________she just walk away from her children like that?

A．should

B．would

C．could

D．need