I thinks we must work hard at whatever we are going to do.It

(In order to master) English ,we must work hard at it为什么这样写? we are going to work hard ____that day (空中填at还是on或in) what are we going to do after work?i am thinking that we cou We must ( )(work)hard. we must do as _____(much) as we can to work hard. we found the work hard to do . 翻译:I am going to do work ( ) at it. I'm going to work hard-----it it's (),so we must().A a hard work,work hard B work hard,har 英语翻译L:Ah,yes,I like it,too.Are we going to dance at the part Whatever high buildings we are going to build ,"Safety first We must work hard,or we'll( )