题目内容：

My younger brother John has a toothache last night. This morning, my mother took him to see a dentist. Go into hospital was always very frightened for John. He struggled to get away while the dentist was giving him examination. He yelled terribly when the dentist was pulling his tooth. Several minutes late, the dentist got everything finished. “I’m sorry, madam, and I shall have to charge you 200 dollars for pulling your boy tooth. ” “200 dollars! Why, you said that he would charge only 40 dollars for such work!” “Yes, but your boy yelled so loudly that he had scared four other patient out of the office.”