The book costs me fifteen yuan.改为：＿＿＿＿ ＿＿＿＿ ＿＿＿＿ the school every day? 怎么改
速度速度啊.
哎呀，打错了。。应该是改为：＿＿＿＿ ＿＿＿＿ ＿＿＿＿ the book ＿＿＿＿ you？