History is the best teacher. It ________ records the development path of each country and foretells the future to us.

—Could you tell Jerry the manager is wanting him when you see him? —Sure, I will _______ I see him.

While reading, Helen has a habit of stopping _____ to give her long and flowing hair a smooth.

It turned out that one of the children I thought a girl was _______ a boy.

 People say that young Chinese students’ eyesight keeps dropping _________ because of both too much homework and poor learning conditions.