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

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：在此处加一个漏字符号（∧）,并在下面写出增加的词；
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11处起）不计分.
Time flies!This is a third year that I have been in this school.In the past two and a half years,our school had organized many activities.What impressed me best was an activity called “Learning to Farm”.In an autumn afternoon,we were sent to a farm which we learned to plant potatoes.Having been in the city for so a long time,we were so happy to go to the countryside.After divided into three groups,we started to work.Some students cut potatoes into pieces; some dug holes,and the others put the pieces of potatoes into the hole,put the earth back and pushed them down hard.We continued doing that until all the work was done.Although we were exhausted,but we felt fulfilled on our way back home.

Time flies! This is the third year that I have been in this school. In the past two and a half years, our school has organized many activities. What impressed me most was an activity called “Learning to Farm”. In an autumn afternoon, we were sent to a farm where we learned to plant potatoes. Having been in the city for such a long time, we were so happy to go to the countryside. After being divided into three groups, we started to work. Some students cut potatoes into pieces; some dug holes, and others put the pieces of potatoes into the holes, put the earth back and pushed it down hard. We continued doing that until all the work was done. Although we were exhausted, we felt fulfilled on our way back home.
1.a third year又一年 -- the third year第三年
2.had organized（过去完成时） -- has organized（现在完成时）
使用过去完成时,前面一定要有一个过去的时间立足,在这过去的基础上再向过去推.这里只有一个表示过去的立足点.意思上来讲,“在这两年半的时间里”是指过去某一刻到现在此刻,用现在完成时.
3.best -- most
令我印象最深：impressed me most
4.which -- where
宾语从句,先行词farm作从句的地点状语,要用表示地点方位的连接副词where
5.so a long time -- such a long time
so后面接的是形容词,such后面接的是名词
6.divided -- being divided 我们是被分盛组的,被动语态
7.and the others -- and others
some...some...others... 一部分……一部分……其他……
one...the other...一个……另一个……
8.into the hole -- into the holes 前面挖的洞都是复数,再词提到,用复数
9.pushed them down hard -- pushed it down hard earth不可数
10.Although 和 but 只留一个
一个句子,如果同时用两个关联词的话,这句话就缺主句了
再问： 第四个是定语从句吧？
再答： 是的，是定语从句。我上面写错了。
we were sent to a farm where we learned to plant potatoes. 我们被带到一个农场，我们在那农场上学习种植土豆。（原句直译：我们被带到一个我们要在那学习种植土豆的农场。）

句子分we were sent to a farm. we learned to plant potatoes on the farm.