One possible version:

Sunday          Fine

It’s an exciting day today. My classmates and I went to the Bird Nest to watch a track and field event of the 29th Olympic Games.Early in the morning, we gathered at the school gate and set out to the Bird Nest by bus. Half an hour later, we got there. Soon after we took our seats, the field and track competitions began. In the field some athletes were competing in the long-jump while a young woman was jumping over a bar in the high jump. About 10 athletes were running in a 200-metre race and they were rushing towards the finish line. All of them tried their best to compete for the honor of representing their countries in the Olympic Games. Standing in the audience area, we couldn’t help cheering for all the athletes. The competitions were so exciting that we enjoyed every minute of them. After that, we went around the Olympic Park and took some pictures in front of the Water Cube. We also bought some souvenirs to remind us of the unforgettable experience.

题目分析：本文是篇材料作文，内容要求讲述学校组织学生去鸟巢观看第29届奥运会田径比赛的活动，讲述过去的事情常用一般现在时，把图片描述的场景变成文字叙述事情的经过。注意增加细节，使衔接合理，还要尽量用高中阶段学习词汇和句型。注意长短搭配。

【亮点说明】 把图片描述的场景变成文字表达出来，是一个信息输入再输出的过程，作者思路清晰，按照时间顺序进行叙述，使文章层次清楚，同时注意应用较高级的短语和句子，比如compete for the honor of ，couldn’t help cheering， remind... of ，还运用了非谓语动词作状语等等。并注意了句子的衔接如：while，so ... that等等，为文章增色不少。