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。
Yesterday I paid a visit to the Hong’en Temple Park with my friends. The park was full of fresh and beauty flowers. When I was enjoying the wonderful scenery around, something unpleasant catch my eye. A young couple on the grass was eating, talking and laughing loudly even if they were the only people in the world. What’s worse, they spat and even threw rubbish onto the grass, ignoring the sign “No littering” nearby. What a shame!
So behavior left me deep in thought. If all visitors to the Hong’en Temple Park do as the young couples did, the park will be severely polluting and soon turned into a huge dustbin. I think both of us should mind our behavior in the public places. Only in this way can we live more comfortable and beautiful surroundings.