Complete the sentences. Use can't and the infinitive in the correct form.

1. A: They only moved in a month ago. B: They can't have known many people.
2. A: Look. Jane is putting on her coat. B: She can't be going out.
3. A: Are we having lunch soon? B: You can't be hungry already.
4. A: Where's Jane? B: I'm not sure. She can't have gone home.
5. A: I've been working all day. B: You can't be tired.
6. A: Why are those people shouting? B: I don't know. They can't have heard the news.
7. A: I can't find my scarf. B: You can't have left it.