假定英语课上老师要求同桌之间交换修改作文，请你修改你同学写的以下作文。文中共有10处语言错误，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。
Jack London had a very hardly life. He born in San Francisco on January 12, 1876. In 1893 he become a sailor. For the next four years he fought and working his way around the world. He begged his food from door to door. When that he was twenty-one he decided to try and get an education, but before a few months he left school and went off to take part in the Klondyke Gold Rush on 1897. She hiked in north western Canada, and came back empty-handed.  Two years late he sold his first story. From that time on he made his livings by writing.