答案：slipped　句意：她趁别人还没醒，溜出了房子。分析句子结构可知该空为句子的谓语动词，由从句中动词时态were可知，应用一般过去时。

　　9．________ (hire) a car, you must produce a passport and a current driving license.

　　答案：To hire　句意：若想租车，你需要出示护照及当前驾照。此处用动词不定式作目的状语。

　　10．By the time she knew the news, John ________ (fly) to America.

　　答案：had flown　由By the time引导的从句的时态为一般过去时可知，主句应用过去完成时，故应填had flown。

　　Ⅱ.单句改错

　　1．This is believed that hard work can lead to success.

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　　答案：This→It 　It is believed that ... "人们相信......"，其中it为形式主语。

　　2．An idea occurred me when I was walking in the park.

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　　答案：occurred后加to　sth. occurs/occurred to sb. "某人突然想起某事"。

　　3．A great many of people gain a great deal of information from the Internet.

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　　答案：去掉第一个of　a great/good many直接修饰可数名词复数，只有当名词前有限定词the/these/those/one's等时，才用a great/good many of短语。

　　4．We regret to inform you that our company has hired on another girl for the job of secretary.

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答案：去掉on　hire "雇用；租用"，为及物动词，后面不需加介词。