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However busy we are, we need to take exercise. Not only___________us keep healthy, it also stops us getting fat.

．Why must I apologize to him? I am in no way_________for the quarrel, after all.

With everyone’s face_________behind the mask, it’s hard to tell who they really are.

Studying abroad, the boy was exposed to a way of life_________he was not at all fanmiliar.

．—We flew to Egypt for the holiday and we all had a wonderful time.

—_________.

—Could you please lead your car to me this Sunday?

—_________you have it cleaned after using it.

．If I _________too late last night, I could not have fallen asleep in class.

Typhoon Morakot swept across Taiwan on August 8. 2009, _________hundreds of people dead or missing.

I’m so surprised that such a clever man as he_________be easily taken in.

．_________the fact that doctors have warned that smoking causes cancer, people still keep on smoking.