Complete the sentences with may/might/could, must or can't.

That boy can't be Lee. He's too tall, and Lee never wears a baseball cap.

1 The operation was successful! You must be really pleased.

2 He's very ill. He may need a transplant. The doctor isn't sure.

3 Their umbrellas are wet. It must be raining.

4 It's still dark outside. It can't be 9 a. m. yet.

5 He's wearing a white coat. He may be a doctor, or he might be a nurse.

6 I could go out later; it depends on the weather.

7 You've been driving all day. You must be tired.

8 'Is your phone ringing? 'No, it can't be mine. I left it at home this morning.