As is known to us, theory is based on practice and servers practice. A. by chance B. in turn C. in return C. by turn
He was very busy yesterday,otherwise he__________to the meeting.
Shortly after the accident,two _________police were sent to the sport to keep order.
The hero of the story is an artist in his_________ .
The Yellow River is_________river in China.
—What do you think of the book? —Oh,excellent.It’s well worth _________time.