短文改错。改正下列短文中的错误。请根据上下文对标有题号的每一行作出判断；如无错误，
在该行右边横线上划一个勾（√）；如有错误（每行只有一个错误），则按下列情况改正；
此行多一个词：把多余的词用斜线（）划掉，在该行右边横线上写出该词，并用斜线划掉。
此行缺一个词：在缺词处加一个漏字符号（∧），在该行右边横线上写出应加的单词。
此行错一个词：在错词下划一道线，在该行右边横线上写出改正后的单词。
注意：原行没有错误的不要改。

Should students make friends on line? Some of people say yes.        The Internet helps make many friends. Chat on line,               students can more free express their feelings and opinions,        and even get help with their foreign languages studies. Others,     therefore, think students should not. They say making friends       on line is waste of time, which should be spent more              meaningfully on study. Beside, some students get cheat?ed on line.   It is my opinion students should place their study, health          and safety before the other things. As for friendship, we can          readily find them in our classmates and other people around us.	1. ________    2. ________     3. ________      4. ________   5. ________     6. ________                              7. ________    8. ________     9. ________      10. ________
1. 去掉 of      2. Chat→Chatting     3. free→freely     4. languages→language    5. therefore→however 6. waste 前加 a     7. Beside→Besides     8. students 前加 that   9. 去掉the   10. them→it
Mr. Johnson is _____ a teacher. He is also our good friend.
[     ]
A. only B. more than C. hardly D. less than
We invite you and your family to attend the activity _____ that special day.
[     ]
A. at B. on C. with D. in
Mr. Dai is _____ an English teacher. He"s also our best friend.
[     ]
A. no more than B. more than C. not more than D. nothing but
Mother wants to be a good provider, a role she has been shouldering _____ her marriage to Father.
[     ]
A. when B. until C. before D. since
We offered him our congratulations _____ his passing the college entrance exams.
[     ]
A. at B. on C. for D. of