Be quiet! The students ______ a physics test in the next room.

―What a heavy rain!―So you’d better _________ swimming today.

We want three good musicians ______ rock band. [ ]

How can I get on well with others, Dad? — Try to smile to others, boy. That will make ________ much ________ .

_____ of the water _____ polluted. We must try to protect our environment.