You _______ smoke .You are only 14 and it isn’t allowed.A. don’t have toB. mustn’tC. needn’t
There _________ a meeting tomorrow afternoon.
Millie and Kitty are good friends, they often _________ each other _________study.
There are about two _________students in our grade.
It’s too cold. How about _________?
—Is your father a doctor? —No, he is a _________. He works in a school.