连词成句。

1. pen pal, on, foot, His, school, goes, to (.)

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2. next to, they, a, hospital, live (.)

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3. mother, Mike's, teacher, is, a (.) 

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4. does, What, father, Liu Yun's, do (?)

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5. the, seeds, put, the, in, soil (.)

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在两种资产之间进行套利交易的前提条件是：两种资产的价格差或比率存在一个合理的区间，并且一旦两个价格的运动偏离这个区间，它们迟早又会重新回到合理对比关系上。______