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。
    My classmate Han Mei and I went to the Palace Museum by taxi on last Saturday.On arrival，I reached for my mobile phone，and I couldn't find it anywhere.Han Mei thought I might have left it in the taxi.Immediate she dialed my number and a taxi driver answered it.He said my mobile phone has been left on the back seat of his car and he would drive back to return them.Twenty minute later，when the driver handed me the phone，I was too grateful that I offered him an extra fee.But he refused with a smile，say that he was very pleasing to have helped me.