合理用钱的语言表达 — 英语填空题
题目
Tom has 50 yuan. Yesterday he spent 15 yuan on a useful book and 8 yuan on a pen. Today his mother gives him 10 yuan. Tom says, "I will save the rest of my money and not buy things I don't ___." How much money does Tom have now? He has ___ yuan now. (第二空填数字)