Our bodies are strengthened by taking exercise．_______ our minds are developed by learning．

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

.I hope I will not be called on in class as I’m not yet____prepared．

--- It is what parents say and do that really matters in children’s character training. --- ___________.

Though brought up in Los Angeles, Steven Davidson spent his whole life      in New York．