两个英语问题,关于非谓语动词的使用

两个英语问题,关于非谓语动词的使用
2006年4月的试卷第32和33题.我一直没懂.
32. ,a form must be filled in.
A.If you want to get this job B.In order to get this job
C.Making request for this job D.To ask for this job
答案是C, 我先了A .说是主句的主语也是状主的主语.我想form需要填好.那主语是form,前面的状语是否要用被动形式?
而C. 选项为何要用ing的一般式呢?
33. in a company, Miss Li will become a famous pop singer.
A.It is an employee that B.She was an employee
C.An employee before D.Once an employee
答案选D. 为什么?这是一种什么样的形式,算是非谓语动词吗?前面的从句是条件从句吗?