关于SAT语法倒装句so用法的句子

关于SAT语法倒装句so用法的句子
1.None of the attempts to specify the causes of crime explains why most of the people exposed to the alleged causes do not commit crimes and conversely, why so many of those not so exposed do.
请问1.alleged 这里做什么成分，是不是过去分词
2. why so many of those not so exposed do.
这里面的so 和 do代替的是什么，如果要按正常语序怎么写
2.According to experienced auto mechanics, it is a good idea to change a car’s oil and filter regularly because doing so helps reduce wear on the engine parts.
3.Fabric was very expensive in the United States before the industrial Revolution, and so scraps were saved and recycled into such items as patchwork quilt and doll clothes.
请问so在这两句中的用法，如果换成正常语序是什么样子的