题目内容：

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。错误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。

Several years before, my friend and I drove to Chicago to pay a visit our other friends. We noticed that there was a homeless man sitting at an exit of the subway. So we bought some food and gave them to him. When he saw what we have bought for him, he became exciting with joy. After seeing his reaction, my friend and I decided to help more people. One night we packed up sandwiches or bottles of water, looking for people whom were in need. When I saw the look of joy on the face of each person we helped him, I was very pleased. It was one of the most amazing feeling in my life.