题目内容：

    It is easier to go downhill t1.to climb uphill. So it is easier to fall into bad habits than into good o2.. Bad habits do not come s3.. They come little by little when people don't n4.their danger. School boys first pick up little bad habits in school and on the street. When they can't write their lessons, they copy from their c5.. If they see bigger boys smoking, they also want to learn to smoke. When they get bigger, the habits become so strong t6.they can no l7.get rid of(摆脱)them. From copying, they f8.behind others, then they learn to steal. At l9., they become suspected by everybody. How necessary it is that we get rid of the bad habits in the 10.!