If I were a billionaire, I would take use of 50% of money and donate the other 50% of it. Many people would buy a house or travel around the world. As for me, I would start a school. If I had a school, I would be able to educate many children and teach them right from wrong. Anyone will tell you that children are the future of a country. If my dream comes true, I will be very happy because I will be doing my country a good service. （只有90字,你可以根据这个框架适当扩展,希望对你有帮助!）