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。
This winter holiday, my classmates and I played the game called drum topping. Eight students tried to control a drum by pulling strings attaching to it and bounce a ball on top of them at the same time. With the ball bouncing on the drum, our feelings rose and fell down with eagerness. It was much tough than expected as it called for quick reaction and perfect cooperation. Everyone was clumsy at first, and we gradually got the trick of determining the ball's drop locations and what to control the ball. We have fun with the game. However, what mattered most was we learned from failure and finished our task perfect through teamwork in the end.
