_________ our earth less polluted, or we will lose our home.
—Mary was heard_______ just now. What happened?—John was telling a joke.
Even if we are very busy, we should spend ______ doing exercise every day.
—Is your father a teacher?—Well, he _______.
_________ the people lost their lives in the traffic accident.
I have _______ much work to do _______ I have no time to go out with you.