I 5000 yuan on this iPhone 4s.A.took B.spent C.bought D.costI ( )5000 yuan on this iPhone 4s.A.took B.spent C.bought D.cost

I spend 50 yuan on this chair.改为同义句. I spent ten yuan on this book.改为否定句I spent ten yuan on this book.改为否定句 划线提问I spend 15 yuan on this book.划线部分15 yuan I sleep 30 yuan on lhis book.同义句 This book _____ _____ 30 yuan. I spent 200 yuan on this vase(改为同意句）I _____ 200 yuan ____ this case i spent 100 yuan on this coat(改为同义句)i_____ 100 yuan _______ this coat.This coat　＿＿＿＿　＿＿＿＿　100 yuan I spend ten yuan on this book请问这里的on怎么解释? I 5000 yuan on this iPhone 4s.A.took B.spent C.bought D.costI ( )5000 yuan on this iPhone 4s.A.took B.spent C.bought D.cost I spend ten yuan on this book 和 I spend ten yuan for this book 后者是对的吗?为什么? I spent 49 yuan on this English-Chinese dictionary(改为同义句) I spent fifteen yuan on this book.改成 It take sb. some money to do sth. This book is useful to me,so I _____ 20 yuan on it yesterday. May I try ___ on 上一句是This pair is only one hundred yuan I spend two yuan on this books.(用cost转换同义句) l spend10 yuan ______ on this book 句型转换：I spend ten yuan on this book.this book cost me ten yuan .答案中的cost为什么不加s,会的来 I spend fifty yuan on this year's Christmas card.(同义句改写)this year's Christmas cards ____ ______ fifty yuan 一道英语通意句转换This book cost me five yuan.（同义句）I _______ five five yuan on this book.说出理由为什么是过去式呢？