what factors causes the fluctuation of the stock marketcauses去掉‘s’，有点吹毛求疵哦which make their profound theories looks more cordial and easy to understand to me中to me 改为for me最后一句是要用impressed！
第一大段最后一行the teacher said to hime中，hime应该改为第三大段，第一行 people havederived 中havederived应该分开写，即写成have derived 语法错误：第一大段第二行，Yu boya famous music master at that time句子成分残缺，没谓语，应该改为Yu boya was a famous music master at that
