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：在錯的詞下畫一橫線，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。

    I had done a lot of volunteer work over my summer holiday.Therefore，the most impressive one was my experience at a youth club for kids and teens，the majority of which were from poor families.The time at club brought us so much joy.It was also greatly to see how they developed our skills over the weeks.Through the volunteer work，not only did I learn how to appreciating the work of volunteers，but also learned that the pleasure of help others is more important than anything else.But now I decide to do more volunteer work in the futures.