假定英語課上老師要求同桌之間交換修改作文，請你修改你同桌寫的以下作文。文中共有10處語言錯誤，每句中最多有兩處。每處錯誤僅涉及一個單詞的增加、刪除或修改。
增加：在缺詞處加一個漏字符號（∧），并在其下面寫出該加的詞。
刪除：把多余的詞用斜線（\）劃掉。
修改：在錯的詞下劃一橫線，并在該詞下面寫出修改后的詞。
注意：（1）每處錯誤及其修改均僅限一詞；
（2）只允許修改10處，多者（從第11處起）不計分。
    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.