Modals of deduction, look (like). Choose the correct words.
Example: What's in that big box? "I'm not sure. It might/must be a TV."
1. They're speaking German. They can't/could be from Germany or Austria.
2. You've just had a drink, you can't/must be thirsty.
3. She looked very smart. She can't/might have been going to an interview.
4. You've been working for hours. You could/must be exhausted.
5. You don't look like/look very well. Why don't you lie down?
6. 'I can't find my briefcase!' "You must leave/have left it at work."

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