1,Three student__in this university come from the South.

题目

1,Three student__in this university come from the South.
a.of ten b.out of in ten c.out of ten
答案我觉得应该是c.但是为什么,a怎么不可以?
2.She broke a __ while she was washing up.The glass cut her finger.
a.glass of wine b.glass wine c.wine glass
我觉得是c,但是老师给答案是a.
3.What do you do to keep healthy?
__ everyday.
a.Exercise b.Exercising
我觉得答案是a,但是b为什么不行?
,希望给出点具体的解释,题目比较纠结

答案

1.of 的话,代表总共有10个学生里面有三个,在一所university里面显然是不对的.用in的意思是十分之三,更合理一些
2.我同意你的观点.应该是c
3.问题是What do you do ,你应该回答（I do）exercise everyday.括号内的可以省略.