分类：教育/科学-外语学习-英语考试
问题：速求：我的英语难题，请老师帮忙解决！我这里有几道英语难题，请各位 
我这里有几道难题，请各位前辈帮忙详解，谢谢！1.How does it happen that the two-party system is so strongly(     )(root)in American politics? veral courses of which i have taken thus far,(    )(prove)to be difficult but useful for almost all students.3.After(     )(interview)for the job,you sill b我这里有几道难题，请各位前辈帮忙详解，谢谢！1.How does it happen that the two-party system is so strongly(     )(root)in American politics? veral courses of which i have taken thus far,(    )(prove)to be difficult but useful for almost all students.3.After(     )(interview)for the job,you sill be required to take a language test.4.The petrol tank is empty.i(    )(fill)it up before we left home.5.Lack of concentration is a sign of your(    )(able)to overcome the distracters.这几个题目是要求在空白处填上括号里所给词语的正确形式，看到这种题目，我有点晕，不知道应当怎样分析和下笔，请老师帮详细解答并翻译成中文，好吗？谢谢！
回答：1.How does  happen that the two-party system is so strongly( )(root)in American politics? 为什么两党政策在美国那么根深蒂固？ veral courses of which i have taken thus far,( )(prove)to be difficult but useful for almost all students.在我目前所选的几门课程当中，经济学被认为是对几乎所有学生都很困难而又实用的一门课。3.After( )(interview)for the job,you sill be required to take a language test.职务面试过后你将被要求参加一个语言测试。4.The petrol tank is empty.i( )(fill)it up before we left home.油箱空了，我本该在出门之前加满油的！5.Lack of concentration is a sign of your( )(able)to overcome the distracters.注意力不够集中是你在克服困境时的一处硬伤。1。rooted2. has been proved erviewing ouldhavefilled5. disability第三题，我又仔细想了一下，确实有些棘手！如果用名词形式，那么至少前面应该加上一个冠词才好啊。各位看看能不能填having interviewed?