A punishment - draft 2

One day, when John went home from cram school, he felt very nervous because he saw a piece of papper on his father's hands. That was his report card of this exam. No wonder his father's face turned red with rage gradually. His father was surprised why John did not do well on his exam. Therefore John told the truth to his father. It was because he laughed at his teacher was as fat as an elephant. Then his teacher was so angry that she failed all John's subjects. After hearing the incident, John's father was so embarrassed about John's teacher. So he ordered his son that he must apologize to his teacher or John could not take the pocket money from his father. So he dicided to apologize to his teacher and became a hard-working student.