He talked a lot about things and persons _____ they remembered in the school.  

下列各句中没有语病的一项是（   ）

假如你叫李华，是一位成绩优秀的学生，你班班主任在安排座位时，让成绩好的学生和成绩差的学生作同桌，这在你们班成绩优秀的学生中引起了反响，大家就此进行了讨论。请以书信形式向报社编辑写封信，陈述学生讨论结果以及个人观点。

注意：1）.词数：100左右，短文的开头已为你写好，不计入总词数。

2）短文需包括表中所有要点，内容可适当发挥，以使行文连贯。

3）参考词汇：成绩差的学生：a slower student

增加：在缺词处加一个漏字符号（∧），并在此符号下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1.每处错误及其修改均仅限一词；2.只允许修改10处，多者（从第11处起）不计分。

    Last Saturday I went to the Great Wall with some of my friends.In our way up,we saw many volunteers working in the sun.They helped the elders with their bags,took photo for some tourists and answered people's questions.Because they were very tired,they didn't stop to have a rest.Just at the moment,we saw a little boy standing alone,cried.We went over and asked what is the matter.From his answer we knew he couldn't find her mother.We told him not to worry and then we tried to get in the touch with his mother with the phone number he had given us. Twenty minutes late,his mother turned up,and thanked us again and again.That day we enjoyed the beauty of the Great Wall,and felt the warm of the society.If everyone can reach out helping to others,the world will be more harmonious.