1 . —Mom, what’s in the box?
—I’m not sure. It ________ be a present from your brother.

A．can

B．would

C．might

D．must

2 . —Mom, do you know where my key is?
—It ________ be on the table, but I’m not sure.

A．must

B．might

C．mustn’t

D．mightn’t

4 . —What’s your plan for the weekend?
—I have no idea. I ________ go to the science museum with my friends.

A．can

B．must

C．might

D．should

5 . Don’t run too fast, Jack. You _______ fall and hurt your knees.

A．might

B．must

C．need

D．should

6 . —Mum, I’ve signed SF Express (快递). What’s in it?
—I’m not sure. It ________ be a present from your sister.

A．should

B．must

C．might

D．would

7 . Your answer ________ be right, but I’m going to ask the teacher to make sure.

A．must

B．can’t

C．might

D．needn’t

8 . —Tony, are you online? Can you answer my question?
—Miss Liu, I guess he ________ not be ready. Can I help him?

A．might

B．will

C．need

D．must

9 . —Is the young man in a white T-shirt our new math teacher?
—He ________ be. I’m not sure.

A．might

B．can’t

C．must

D．need

10 . —Mrs. Smith, can I hand in my paper now?
—Wait. There are still a few minutes left. Your answers ________ be right, but it’s better to check to make sure.

A．must

B．might

C．shouldn’t

D．can’t