Mr. Green told us _____ turn the lights off when we leave the classroom.

Which is more important, Chinese or English– I think Chinese is ______ English. I like both of them.

With the development of the Internet, _______ communication is done by regular mail.

It’s very hot in the classroom. _______ open the windows

________will it take I have little time left.—Don’t worry. It won’t take you much time.