We work together to achieve our common purpose: ________ world that is safer, cleaner and healthier than ________ one we are living in.
—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.