10 - Lesson 89 For sale

10-1 词汇：since

10-2 词汇：cost

10-3 课文：This house is for sale.

10-4 课文：I can t decide it yet.

10-5 语法：宾语从句

10-6 词汇：动词过去式、过去分词不规则变化2

10-7 句型练习：Have you…yet