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处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏词符号(/\)，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： 在错的词下画一横线，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。
Alibaba's founder Jack Ma, his company has been valued at more than $22 1billion of which Ma owned 6%, is put in the top position among China's wealthiest. But he stays outside the list of the world's 10 rich people.
Fought against a hard life, young Ma still managed to learn English well ‘enough to gain a degree and became a teacher, Afterwards he started a translation agency in which took him to the US, where he introduced to the Internet. His fate was bound to change before he was accidentally appointed to take an American visitor Jerry Yang, a co-founder of Yahoo, in a tour of the Great Wall. The meeting obvious proved to be a turning point for all of them, promoting the birth of Alibaba and the later cooperation with Jerry Yang.
