1. 用must, might或can't填空

1. （1） The textbook be his. His name is on it.

3. （2） That be Mary-she's in New York.

5. （3） Li Ming get here in time, but I am not sure.

7. （4） The toy be Bob's. He is the only little kid.

9. （5） I can't find my pen. It be left at home.