1 . 假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改.
增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下画一横线，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 Sunday, our school held on a 5-kilometer cross-country running race, that attracted many enthusiastic participants. Actually, all the student in our school attended the activity.

The race started from the school gate and ends at the foot of the South Hill, covering five kilometers all together. The whole course was quite difficulty, especially the part near the mountain, narrow but rough. All the participants spared no efforts finish the race.

This race gave us a opportunity to have a deeper understanding of patience as well as build up our bodies. However, we all think highly of it, and expect more activities like this in the future.