—He ______ be in the classroom, I think.—No, he ______ be in the classroom. I saw him go home a minute ago.
Her father and mother ______ drinking black tea.
There isn’t _______________with your computer.
We should use _______ people and ______ money to do the work better.
Who listens ________, Tom, Jack, or Bill?
Tom and Mike are in ___________ school, but they are in ________classes.