According to the school rules, no student _______ go out of school without the permission of the teachers.

—I was asked to attend the meeting before eight.—Oh, you________. I'm sorry for not telling you that we have changed the plan.

Liza _ ___ well not want to go on the trip---she hates traveling.

The bicycle looks much like mine, but it isn’t.        it be John’s?

--- Listen! David is talking happily with his mother in the next room.　--- It ______ be his mother. She has gone to Yunnan to be a volunteer doctor.