1 . —Lucy, I’ve signed for a big box by Express. What’s in it?
—I’m not sure. It ______ be a present from my brother.

A．might

B．must

C．should

D．will

2 . —Where are you going next week?
—We _________ go to Wuhan, but we’re not sure.

A．might

B．must

C．can’t

3 . —Whose basketball is this?
—I am not sure. It ________ be Gina’s. She can’t find hers now.

A．can

B．must

C．might

D．can’t

4 . —Where’s Jeff?
—I’m not sure. He ________ be playing with his brother.

A．might

B．can’t

C．can

D．must

5 . 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

6 . —The book Red Star Over China ________ be Linda’s, but I’m not sure.
—You’d better ask Linda if it’s hers.

A．can’t

B．might

C．must

7 . —Where’s Jeff?
—I’m not sure. He _________ be playing with his brother.

A．can’t

B．might

C．can

D．must

8 . —What’s your plan for this coming summer vacation?
—I ________ go to Gansu, but I’m not sure.

A．must

B．need

C．should

D．might

9 . —Look! Who does the book Harry Potter on the floor belong to?
—It ________ Lily’s book. She is a book lover of magic novels. But I’m not sure.

A．can’t be

B．must be

C．might be

10 . I attended a concert yesterday, so my schoolbag ________ still be in the music hall.