Betty to represent our school to take part in the Maths Olympics.

k you should complain—, of course, you are happy with the way things are.

She will tell us why she feels so strongly that each of us has a role _____ in making the earth a better place to live in.

15. In an emergency, you should remain _____.

A friend of ______________ thinks he won’t pass the exam.—I think he should believe in ．That’s the secret of success．