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。

    On December 30, after two weeks' training, we finally began our work for volunteer guides in a museum. During the first two weeks, I learnt a lot about the story behind the artworks. In order to do good in the work, my teammates and I made fully preparations. We first worked out a careful plan. Then we practiced use proper body language to explain the artworks better. The month-long volunteer work has now come to end, from what I understand that it isn't easy to be a good guide. Besides. I also realize that how important teamwork is. I believed that I will get lifelong benefits from the short and meaningful experience.