She is eating a sandwich. She _______ be hungry. ( can't / may / might not / won't )
may
He is only 5 years old. He _______ be a teacher. ( may / might / could / can't )
can't
There's a cake in the kitchen. It ______ be Maria's birthday. ( may / can't / mustn't / might not )
may
He _______ be at home. The lights are on. ( could / can't / might not / won't )
could
She is wearing a wedding dress. She ______ be a bride. ( can't / might )
might
This exam is very easy. The answers _______ be difficult. ( may / can't / might / could )
can't