your parents        you?

 --It ______ be the new headmaster.-- No, it ______ be him. He went to Beijing yesterday.

We’ll make laws______ our environment.

—__________ computers are there in your class? —There are forty-five, forty-four for students and one for the teacher.

—I’m busy with my schoolwork these days.—That’s great! You won’t get good grades ______ you work hard.