吃饭时 是用in dinner还是on dinner,at dinner?

吃饭时 是用in dinner还是on dinner,at dinner? in 还是 at breakfast,lunch,dinner? dinner 做晚餐是用cook dinner 还是 make dinner? 是have a dinner 还是have dinner? We are eating dinner _____ the table .用 at 还是用 on ,为什么? 煮晚饭是cook dinner 还是cook the dinner at the dinner table make a dinner还是make dinner? Dinner in Chinese entertain friends at dinner;“dinner”前为什么用“at”,不用“for”,“at”一般 We have lots of food () dinner.A.in B.at C.for D.on