英语语法问题1.Don’t risk ______ the job which so many people want.

英语语法问题
1.Don’t risk ______ the job which so many people want.
A. losing B. to lose

2.Fruit is rich _______ vitamins.
A. with B. in
C. at D. of
3.__ in the country, we had few social engagements.
A. Living B. Having been lived
C. Being lived D. Having lived
4.“You haven’t lost your ticket, have you?”
“I hope ______ .”
A. so B. no
C. not
选哪个为什么说明原因?