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