Choose the right modal verb to fill in the gap.
1. Helen has no friends. She _______ be very lonely. (can't / may / must)
2. This milk _______ go off if you don’t put it into the fridge. (can't / may / must)
3. Mike _______ be at university right now. I saw him 10 minutes ago at home. (may / can't / must)
4. She _______ have been running very fast. She is totally out of breath. (must / may / can't)
5. I'm busy this morning, but I ____ see you this afternoon if you like. (can / must)
6. They're two hours late – there ___ be something wrong. (must / can)
7. ____ you smell something burning? (Can / Must)

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