—Is Mr. Green in the office?—No, he ________ be in the office. Look, the light in the office is off.
Don’t cut in line, or other people may _______.
Tom is a friendly boy, so he is very easy to _______ .
There is _______ bridge in the old town.
Students need at least eight hours to sleep, or they are_______ in class.
He _______ be a history teacher.