Nowadays people are more concerned about the environment _______ they live.
Mr Zhang, a man calling himself Peter, __________ all day. Could you speak to him now?
Of all the plays __________ recently, none is more impressive than Tea House by Lao She.
—Is there a place __________?—I'm afraid there're no other places free at the moment.
Misunderstandings __________ from lack of social communication, unless __________ properly, may lead to serious problems.
All the branch companies are __________ the members of the family.