Ⅰ. 选词填空
1. — Where is Jack?
— I'm not sure. He (might/must) be on the playground.
2. — Is that girl Susan?
— It (mustn't/can't) be her. She left for Shanghai yesterday.
3. — (can/must) I borrow your pen?
— Sure, here you are.
4. — Must I finish it at school?
— No, you (needn't/may not). You can do it at home.

might
can't
Can
needn't

Ⅱ. 完成句子
1. 他房间里的灯亮着。他一定在家里。
The light in his room is on. He at home.
2. 街区里一定有人在唱歌。
someone singing in the neighborhood.
3. “那是谁的帽子？”“它不可能是简的,有可能是玛丽的。”
— hat is that?
— It be Jane's. It Mary.

1. must be
2. There must be
3. Whose; can't; might belong to