С! fill the gaps using must, may или can’t. it be true. i don’t believe you! mike be at the university right now. i saw him 10 minutes ago. john be a teacher. i don’t really know. this be my towel. i can’t recognize it. she be playing the piano now. i can hear music. this milk go off if you don’t put it into the fridge. she have been at the meeting when i called her. they left for london last week, they didn’t tell me. she have been running very fast. she was totally out of breath. helen has no friends. she be very lonely.

It __can't_ be true. I don’t believe you!

Mike must___ be at the university right now. I saw him 10 minutes ago.

John ___may be a teacher. I don’t really know.

This can't___ be my towel. I can’t recognize it.

She ___must___ be playing the piano now. I can hear music.

This milk ___may go off if you don’t put it into the fridge.

She ___must have been at the meeting when I called her.

They ___may have left for London last week, they didn’t tell me.

She must___ have been running very fast. She was totally out of breath.

Helen has no friends. She ___must be very lonely.