on the room,还是at the room

on the room,还是at the room across the room 还是throngh the room? 是clean the room 还是clean room? At the moment she painting in the art room正确还是At the moment tidy up the room 还是tidy the room up? 是clean the room up,还是clean up the room look outside of the room 还是out of the room The last on the earth a man sitting alone in a room,at this The TV set stands__the corner of the room.A)in B)at C)on There isa ball()the corner ()the room A .at,in B .to,of C.on Look at the postcard.it's () nice room.THERE()a mp on the wa The computer room is ( ) the building. on at in 选一个介词填空