【小题1】Jane isn’t as slim as Amy.（改为同义句）
Amy is slimmer about walking than Jane.
【小题2】Why don’t we walk slowly around the lake? (同义句)
What fewest points How long slowly around the lake?
【小题3】He got fewer points than the other students in his class. (同义句)
He got the didn’t do in his class.
【小题4】She spends 2 hours doing her homework every night.（对划线部分提问）
does she spend doing her homework every night?
【小题5】He did his homework until 10 o’clock last night.(改为否定句)
He his homework until 10 o’clock last night.
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解析：
试题分析:
【小题1】此题考查同义句的相互转换，原句是詹妮不如艾米苗条，用另外一种表达方式是艾米比比詹妮苗条多了，故用slim的比较级slimmer。
【小题2】此题考查固定短语why not do sth=what about doing sth表示为什么不表示一种建议。
【小题3】此题考查形容词的比较级和最高级的相互转换。他的的分数是全班最低的。
【小题4】此题考查就划线部分提问，因2 hours是时间段，故用how long来提问。
【小题5】此题考查一般过去时的否定句的结构，不管主语是什么，谓语动词都要用didn’t do的形式。