第一句是这样的， asking后面跟了2个并列的宾语从句， 也就是asking which teachers are..., and (asking) who will be ...
of those 是指介宾短语作状语，those是指前文提到的“愿意留任到学期结束的那部分教师",
对这部分（愿意留任到学期结束）的教师，谁在提升教学效果方面成效最大呢？
相当于说 We asked that [in relation to those teachers / of those teachers], who will be the most...
第二句没什么特别啊， these这里是限定词修饰salespeople。这些销售中的哪一个会保住饭碗？
which of these people is going to... = which one of these people is going to
差别是第一个which是代词，第二个which one 的which是限定词。
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