9．I still remember the day ________ I worked on the farm.

　　解析：先行词为 the day，定语从句中缺状语，故用 when 引导。

　　答案：when

　　10．I apologized ________ her for my rudeness.

　　解析：apologize to sb. 向某人道歉。

　　答案：to

　　Ⅲ.语法填空

　　The Vikings were the first European __1__ (reach) America. They were a group of people __2__ ancestors came from Scandianavia. By around 900 AD, there were many places in Northern Europe where the Vikings chose to live. In 982 AD, when a man __3__ (call) Eric the Red decided __4__ (set) sail further west, there were as many as 10,000 Vikings __5__ (live) in Iceland.

　　According __6__ the old stories of Iceland and Norway, Eric the Red was forced __7__ (leave) Iceland because he had committed a murder, for which he got __8__ trouble. Eric set sail with 25 ships, of __9__ 14 made __10__to Greenland.

　　答案与解析

　　1．to reach　序数词后用不定式形式作定语。

　　2．whose　whose 引导定语从句，在从句中作定语。

　　3．called　a man 与 call 之间为被动关系，故用过去分词形式作定语。

　　4．to set　decide 后跟不定式形式作宾语。

5．living　Vikings 与 live 之间为主动关系，故用现在分词形式作定语。