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

1) You had lunch. You can't be hungry.

2) She's wearing a wedding ring so she must be married.

3) The traffic pollution is very bad. There must be a lot of cars.

4) Jo isn't at home. He could be in town or at the beach.

5)She's crying. She can't be very happy.

6)I can't find my keys. They could be in my bag or in my jacket.

7)He didn't answer. He can't be at home.

8) He's wearing a white coat. He could be a doctor. I'm not sure.

9) You went to bed late. You must be tired.

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