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

A．might

B．can’t

C．can

D．must

2 . 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

3 . —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

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

A．can’t

B．might

C．can

D．must

5 . —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

6 . —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

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

8 . Tony wrote down my phone number to remember it.
Tony wrote down my phone number ________ ________ he ________ remember it.

9 . —Is there a high-speed train to Beijing tonight?
—There ________ be one. But you’d better make a call to make sure.

A．might

B．will

C．can

D．must

10 . —Where are you going this month?
—We ________ go to Jinan, but we are not sure.

A．might

B．must

C．can’t