Complete the sentences. Use must, may or can't and the infinitive in the correct form.

Here are the completed sentences: 1. A: They only moved in a month ago. B: They can't know many people. 2. A: Look. Jane is putting on her jacket. B: She may go out. 3. A: Are we having lunch soon? B: You must be hungry already. 4. A: Where's Jane? B: I'm not sure. She may go out. 5. A: I've been working all day. B: You must be tired. 6. A: Why are those people in the street? B: I don't know. There must be an accident. 7. A: I can't find my scarf. B: You must have left it at home.