题目内容：

假定英语课上老师要求同桌之间交换修改作文，请您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：把多余的词用斜钱（\）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。

Last Friday, I was standing near a subway exit，tried to call a taxi．But no luck．Then I thought of the taxi booking app my friend has recommended and I booked a taxi through my cell phone．Soon it came，and I stepped in，feeling pretty proudly of my high tech way and satisfied with the convenience brought by the app．So later, I was upset to find that the driver was busy looking his cell phone to get the next order．It was just then when I began to worry about my safety．What’s bad，the driver’s informations might be unreliable．How can we passengers’ legal rights be protecting if something bad happens? So be careful when you use the taxi booking app the next time．