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 . My nephew William is still a puzzle to me—sometimes he is as quiet as a mouse, while he______be fairly active at other times.

A．should

B．need

C．must

D．can

4 . —— Look at the man in pink over there! Is he John?
—— He ________ be John who is away on a business trip now.

A．shouldn’t

B．mustn’t

C．may not

D．can not

5 . It _________ be quite cold in the mountains at night, so you’d better take a thick coat.

A．would

B．need

C．dare

D．can

6 . —Could I hang out with my friends this afternoon, mom?
—________. But you have to finish your homework first.

A．Yes, you can

B．Yes, you could

C．No, you can’t

D．No, you couldn’t

7 . —He ______be in the classroom. I think.
—No, he ______ be in the classroom. I saw him go home a minute ago.

A．can; may not

B．must; may not

C．may; can’t

D．may; mustn’t

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

A．must

B．needs

C．may

D．could

9 . With no gravity to push against, astronauts’ bones and muscles ________become weak.

A．should

B．must

C．can

D．need

10 . —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