不填.本句句意为；我们安排你在多余的房间就寝.
put sb,up 为某人提供膳宿.根据这一习语用法,本空不填即可
例如；1,I'm afraid I can't put you up; you'll have to go to a hotel .
2,We'll put up at a hotel with friends for the night .
由以上例句可看出如后面跟时间名词则用介词for.