9．Seeing the big crowd coming towards him, he started to run down the hill, but________(slip) and went down on his hands and knees in the melting snow.

　　解析：句意：看到那一大群人向他走来，他开始往山下跑，但是滑了一跤，四肢着地摔倒在正融化的积雪中。slip "失足，滑倒"。

　　答案：slipped

　　10．The old rules have to be________(revise) because they only applied to the circumstances that existed when they were made a hundred years ago.

　　解析：句意：这些古老的规则必须得修改了，因为它们只适用于一百多年前被制定时存在的情况。revise "修订，修改"。

　　答案：revised

　　Ⅱ.定语从句

　　1．We'll reach the sales targets in a month________we set at the beginning of the year.

　　解析：句意：我们将在一个月后完成我们在年初定下的销售目标。分析句子结构可知，定语从句中 set 后面缺少宾语，先行词是 the sales targets，故用 which/that 引导。

　　答案：which/that

　　2．I am looking forward to the day________my daughter can read this book and know my feelings for her.

解析：句意：我一直期盼那一天，我的女儿能够读懂这本书并且知道我对她的情感。先行词是 the day，定语从句结构完整，所以用