升级三：把句5升级为分词作状语结构。

　　___________________________________________________________________________________________________________________

　　答案：Wearing the volunteer uniform and volunteer identity card, we got down to work.

　　升级四：把句7升级为定语从句。

　　___________________________________________________________________________________________________________________

　　答案：Some offered assistance to the people who had problems with using the computers.

　　升级五：把句8升级为“连词＋非谓语”的省略结构。

　　___________________________________________________________________________________________________________________

　　答案：When doing voluntary work, we did our part in helping others.

　　第四步：做好衔接，连句成篇。

　　___________________________________________________________________________________________________________________

　　One possible version：

　　March_29th,_SundayFine

　　Today_some_classmates_and_I_served_at_Capital_Library_as_volunteers. At 9 o'clock this morning, we gathered together at the gate of the library. After getting into the library, we were first trained by a librarian on how to operate the computers to borrow or return books so that we could help readers later. Then, wearing the volunteer uniform and volunteer identity card, we got down to our work. Some of us helped with finishing bookshelves and some offered assistance to the people who had problems with using the computers. All of us took our tasks seriously and tried to do them well.

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