根据提示，写一篇短文介绍张华的变化。词数60 左右。
提示：张华，一个九年级学生。家庭富裕(rich)。过去零花钱常常花在打电脑游戏上。现在，他努力学习，将零花钱大部分捐给UNICEF. 他觉得帮助别人会使他自己快乐。
Zhang Hua is a Grade 9 student. His family is rich. He used to spend most of his pocket money playing computer games.. Now Zhang Hua works very hard at school . And he donates most of his pocket money to UNICEF. He thinks helping others makes him happy.(词数太少)
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