Look, Dad's already wearing his jacket. This one __ be his!
can't
might
must
She isn't answering her phone. She __ have it with her.
might not
must
might
That little boy is crying. He __ be lost.
might not
could
can't
Be careful! That dog __ be friendly!
must
may not
may
Look, he's wearing a hat, scarf and gloves. It __ be very cold outside!
can't
may not
must