某项目计算期为20年，各年的净现金流量如下表所示，该项目的行业基准收益率为10%，则

     When Wang Hai went to Yucai Middle School two years ago, he worked hard and did very well in
his lessons. He was also    1    in sports. He ran to school every day to build up his    2   . His parents
were very    3    him and bought him a computer as a birthday present. However, something began to
change. He stopped    4    early and never ran to school any more. He    5    his interest in studying.
     One day in the middle of the night, Wang Hai's mother discovered the cause of the    6   . He played
computer games till midnight. It had a    7    effect(影响) on him and must be stopped. The next day
Mother had a serious talk with Wang Hai.    8    taking the computer away, she told him he was    9   
enough to control himself. Wang Hai was happy he had a wonderful mother and    10    not to do that
again.