I don,t know which room i can live in这里为什么要用in O(∩_∩)O谢谢

I don,t know which room i can live in这里为什么要用in O(∩_∩)O谢谢 I don't know which room i can live in.中in 省不省? can you tell me which room i can live in 为什么live后加in 比如说：I don not know which room to live in ,什么时候加“in” I don't think this room comfortable to live in. ( )I am,weak in English.I don't know _. This is the room _ I live.A.in which B.which l like to live in new style house.i don't like o-----ones 是I don't know which one is your father还是I don't know which o I live in Room 302中的介词为什么用In Does he still live in that street?I don't know.(改为宾语从句 I don -we have no room to____(live in \live),but I can't decide(选择