是in my math还是on my math?I will be hard-working on my math我记得是IN才对呀.它们两个能通用么?

是in my math还是on my math?I will be hard-working on my math我记得是IN才对呀.它们两个能通用么? 是on my birthday还是in my birthday 是 in my opinion 还是 on my opinion 是in my mind 还是on my mind? in my left 还是on my left? on my life 还是in my life? in my studies还是on my studies 是in my winter holiday 还是 on my winter holiday.还是其他介词如题 my experience in class还是on class 是用in my winter holiday还是on my winter holiday? 英语翻译是 u r on my way还是 u r in my way 英语介词使用的问题:到底是in my mind 还是on my mind? 它在我的计划中是it's in my plan,还是on my plan? on my spare time还是in my spare time on my first day还是in my first day 应该是In my winter holiday还是On my winter holiday My classmate often ____ me with my math?是help还是helps? make difference on my life?make difference on my life还是make difference in my life