完形填空

阅读下面短文，掌握其大意，然后从各题所给的四个选项中选出一个最佳答案。

　　On the first day of school our teacher let us know someone．Looking out, we found an old woman 　　1　　 at the door．She said, “Hi, my name is Susan, I'm seventy years old．” While we were 　　2　　 what made her take this challenge(挑战)at her age, she said with a smile, “I'm here to meet a rich husband, get 　　3　　, have two children and travel together．” Hearing this, all of us laughed．“In fact,” she went on, “ I always 　　4　　 of having a college education, and now I'm getting 　　5　　!”

　　After class we had chocolate and milk together．We became good 　　6　　．I often listened to this “time machine” as she shared her study with me．

　　At the end of the term we invited Susan to give us a 　　7　　．When she was stepped up to the front, suddenly she found she took the wrong paper．She felt a little frustrated(沮丧的)and said, “I'm sorry．I'm so nervous that I can't get my ready talk 　　8　　, so I have to tell you 　　9　　 I know．”

　　In her speech she told us, “We don't stop playing as we are old, we grow old because we stop playing．The secret of staying 　　10　　, being happy and getting success is that we should laugh and find something 　　11　　 every day．I think there is a great 　　12　　 between growing old and growing up．I am seventy now．If I 　　13　　 in bed for one full year and never do anything．I'll become seventy－one．Since anybody can grow older, my idea is to grow up by always finding the chance in change．Growing older can't be avoided(避免的), growing up can be 　　14　　．It's never too late to be all you can be possible．”

　　During the four years' study, it was so easy for Susan to make friends 　　15　　 she went．In the end, the wonderful woman got a college degree．

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