----Your monitor is never late for school, is he?--- ______.He always comes to school earlier than others.
The box is __________heavy for me _________carry.
He often saw his mother __________ clothes .
The boy is ________ see the teacher because he ________ a mistake.
Beijing is one of the ______ in the world today.
Lily will give a talk tomorrow. She is thinking about ________ to make everyone happy with her speech.