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
I recognized him_________ I saw him in the crowd.
Had I known her name,I________.
Every year _____ money and energy is spent on environment protection.
She made it quite clear that she was no longer going to______my selfishness and moodiness.
As the busiest woman in Norton,she made ________ her duty to look after all the other people’s affairs in that town.