Who is the tallest boy? —It ______ be John. John is of medium height.

.He was about to leave ______the telephone rang; ______was from his mother.

I don’t know what her interests are, because we talk about work when we meet.

Could you help me_______ when the plane will take off on the Internet ?—— I’m sorry , my computer doesn’t work.

If you don’t pay your electricity bill, it will be _______.