A．单句填空
1．Only when Lily walked into the office________she realize that she had left the contract at home.
答案 did [句意：直到Lily走进办公室，她才意识到她把合同忘在家里了。“Only＋状语从句/介词短语/副词”作状语放在句首时，主句多用部分倒装；由宾语从句中的过去完成时可知，主句应用一般过去时，故填did。]
2．Here________my tips for you.
答案 are [本句使用了倒装结构，句子主语是my tips, 故用are。]
3．Not only________the nurses want a pay increase, they want reduced hours as well.
答案 do [句意：护士们不仅想要增加报酬，她们也想要减少工作时间。“Not only... but also...”连接两个并列的分句时，若not only位于句首，则其后的从句要用部分倒装结构。]
4．At no time________they actually break the rules of the game. It was unfair to punish them.
答案 did [句意：实际上他们从未违反比赛规则，所以惩罚他们不公平。题干中表示否定意义的at no time置于句首，后面的句子应该部分倒装，又根据题干可知时态应为一般过去时，故用助动词did。]
5．Not until he went through real hardship________he realize the love we have for our families is important.
答案 did [句意：直到经历了真正的困难，他才意识到我们对家人的爱是多么重要。“Not until...”置于句首，主句需要部分倒装，故用助动词did来帮助构成部分倒装结构。]
B．单句改错
1．No sooner did Mo Yan stepped on the stage than the audience broke into thunderous applause.
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答案 did→had [句意：莫言一上台，观众就爆发出雷鸣般的掌声。no sooner... than...结构中，no sooner位于句首时，主句应部分倒装，即将助动词或be动词放于主语前；主句的时态常用过去完成时，故用had。]
2．Only when you can find peace in your heart do you keep good relationships with others.
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答案 do→will [句意：只有当你的心态平和时，你才能与别人保持好的关系。“only＋状语从句”置于句首，后面的主句需部分倒装。时间状语从句中谓语动词为一般现在时，主句需用一般将来时，故用will。]
3．Only when he apologizes for his rudeness do I speak to him again.
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答案 do→will [“only＋时间状语从句”放在句首，采用部分倒装。when引导的从句用一般现在时表将来，主句用将来时，故用will。]
4．“Never for a second” the boy says, “do I doubt that my father would come to my rescue.”
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答案 do→did [never否定副词位于句首采用部分倒装，根据宾语从句中的谓语动词可知用一般过去时，故用did。]
5．Only with the greatest of luck does she manage to escape from the rising flood waters.
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答案 does→did [only修饰介词短语位于句首采用部分倒装，根据语境可知发生在过去，故用did。]