when we are asleep ,we need ( ) air.为什么?

when we are asleep ,we need ( ) air.为什么? we need air to breathe.we need air to survive.And when we br When we are asleep,ourWe can do better at our l___and we fee "when are we leaving"为什么不是"when do we leave" we don't need air conditioning,nor can we afford it .为什么要用no we could close all the windows when we are using the air con we cantn`t close all the windows when we are using the air c in air we australia summer need conditione We don’t need air conditioning,____. We need air ,water ______ _______ (live). We need air to survive同义 "we need air to survive" means "air ( ) us ( ) 怎么填空?