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
---Who is to give us the lecture today? ---The lady _____ our headmaster into the hall.
Those who don’t get their sufficient sleep are actually sending a(n) _____ to severe problems in their life.
If we learn to accept change and appreciate what is new and different, we will be well-prepared for whatever the future may have _______.
—Though it in the desert most of the year, people still live there.—That’s the case. They say east or west home is the best.
Many experts seem to agree that _______ certain limit should set on ________ consumption of cars to ease air pollution.