假定英语课上老师要求同桌交换修改作文，请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。
I am the shared bike. I'd like to be on the street to serve for people. They can ride me just via a mobile app. But horrible things happen a few days ago. Several people stole some of us with paying their bills on the app but treated us badly. They broke my saddle and even threw my friends everywhere. We felt angry for which those bad guys had done. Thanks to some kindly people, we received careful “treatment”. Now, you help as well as the whole society's attention is what we need most. We are designed to help people who are stuck the heavy traffic. We are neither toy nor private vehicles. Please obey the basic rules.
Qingdao, ______ the 60th anniversary of the founding of the PLA Navy.