求讨论 三道GWD题目

architect111

The first:
So dogged were Frances Perkin's investigations of the garment industory,so persistent her lobbying for wage and four reform，that Franklin recruited Perkink to work within the government.这句中，so persistent her lobbying for wage and four reform,是不是缺少了个be动词？
The second:
Yellow jackets number among the 900 or so species of the world’s social wasps, wasps that live in a highly cooperative and organized society consisting almost entirely of females—the queen and her sterile female workers.这一句的开头中 那个900是什么成分？
The third:
Many experts believe police makers,now viewing...as...,are almost certain to...本句中，若在makers之后加上who，会有什么影响？

这是今天做GWD语法题的一些问题及思考，求G友们讨论，分析，解答，感激不尽。。。。。。