Peter, hurry up! Or _____we get there; the performance will have been over.[ ]

You see, there are a lot of cars and people on the street. —Yes, it’s very______.

In recent years the environmental pollution has been _________ than before.

Do you know ______ woman in red?—Yes, she’s a professor of_________ university.

Some students often fought because of small things in daily life.– So they did. It is important to learn how to with each other.