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：在错误的词下划一横线，并在该词下面写出改正后的词。
注意：
1）每句不超过两处错误；
2）每处错误及其修改均仅限一词；
3）只允许修改10处，多者（从第11处起）不计分。
A group of boys was playing a game around a tall tree. They decided see who was the first one to get to the top of the tree. Their mothers were looking at the children when they played. One of the climber was David. He was a 8-year-old short boy. Nobody thought he would win the competition. Then the game started. All of the boys tried their best to climb as higher as they could. Though they all made it halfway up the tree before David did, but David reached the top of the tree fastest in the end. His mother was pride of her son. She asked him how he reached the top of the tree so quick. David said, "It was easy. The another children kept looking down when they climbed. When they found how high they were, they got scared and were afraid of fallen down. I only looked up until I got to the top."
