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Fill the gaps using must, may or can’t.

It _____ be your mother. She looks so young!
Ann _______ be at school right now. I spoke to her on the phone 10 minutes ago.
Carol ______ be at home. I don’t really know.
Jane _______ be at work. I am sure today is her day-off.
He ______ know her husband. They work for the same company.
She ______ be having breakfast. She never has breakfast at home.
This car ______ be mine. Mine is red.
She _______ have to leave her children with her mother, but she isn’t certain yet.
You _______ have eaten the whole cake, it was so huge!
She _______ like French rolls. She buys them sometimes.