Must I go out with him—No, you _____ .

You have been working for hours. It’s no______ you areexhausted. Why not take a rest

Boys and girls , sit down ，please. —____________________.

It ____ be our headmaster. He has gone to Beijing.

It _______ be Mr．Johnson who is in the office．— No, it _______ be him．I saw him off at the airport half an hour ago．