此题要求改正所给短文中的错误。对标有题号的每一行作出判断：如

此题要求改正所给短文中的错误。对标有题号的每一行作出判断：如无错误，在该行右边的横线上画一个勾(V)；如有错误(每行只有一个错误)，则按下列情况改正：

    该行多一个词：把多余的词用斜线(＼)划掉，在该行右边横线上写出该词，并也用斜线

(＼)划掉。

   该行缺一个词：在缺词处加一个漏词符号(∧)，在该行右边横线上写出该加的词。

   该行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。

   注意：原行没有错的不要改。

          According to a survey, quite few junior and senior students                    1．        

    visit Internet bars frequent They are there mainly to play games．              2．        

    Worse still，many of whom even look at some unhealthy pictures，             3．        

    Some of the students sometimes stayed in the bar for a whole night．         4．        

    All these have a bad effect not only on  their studies but also                5．        

    on their health．And it is no doubt that Net bars do no good to               6．         

    students．I think students should make the full use of time, work            7．         

    hard at their lessons and  try their best to gain more knowledges             8．         

    in order to have a bright future．I’m sincerely called on these               9．       

    students who are addicted to Net bars to keep far away from it。             10．         

1. quite 和few 之间加a    2. frequent→frequently   3. whom→them   4. stayed→stay  

 5. √    6. it →there    7. 去掉the    8. knowledges→knowledge  9. called→calling   . 10.it→them