There are advantage for students to work while 1._______

题目

There are advantage for students to work while 1._______
　　studying at school.One of them was that 2._______
　　they can earn money.For the most part,3._______
　　students working to earn money for their own 4._______
　　use.Earning their own money allow them 5._______
　　to spend on anything as if they please.6._______
　　They would have to ask their parents for 7._______
　　money or for permission to do things by 8._______
　　the money.Some students may also to save 9._______
　　up for our college or future use.10._______
第2行为什么把was改为is不是one of 后加复数么.第五行为什么改成allows

答案

把was改为is是因为整篇文章都是用一般时,所以不能突然冒出来一个过去式.
而one of后面加复数指的是of后的名词加复数,正如them；但是谓语是要用单数的,因为one of做主语,不是them做主语.
第五行改为allows是因为earning their own money动名词做主语,所以用单数