下面短文中有10处语法错误。请在有错误的地方增加、删除或修改某个单词。
增加：在缺词处加一个漏字符号（∧）,并在其下面写上该加的词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下划一横线，并在该词下面写上修改后的词。
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11处起）不计分。
Once upon a time there was a boy who fond of reading. However, he was very poor to buy any books. That was the reason that he had to borrow books from a rich man who owned a lot of books. The boy knew clearly that he has to finish reading the books he had borrowed them and return them to the owner as soon as possible. A rich man, who was ready to lend any of his book to the boy, read few of his own books. With time going on, the boy read a lots but finally became a famous writer in his time. Though the rich man had so many books, he remained a man with little knowledge because of he seldom read his books.