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。
In the past three years, many activities had been organized by our school. What impressed me mostly was an activity calling “Learning to Farm”. In an autumn afternoon, we went to a farm, where we learned knowledge and had many fun. Having been in the city for such a long time, we were more than happy to go to a countryside. After we arrived, we divided into three groups. Some students learned how to raise pigs, some worked in the garden, and the other helped the farmers with the work in the fishpond. It was not until it was totally dark when we stopped working. Though we were tired out but we felt pleased on our way back home.
