keep the air freshly还是keep the air fresh,keep不是动词吗adv修饰他啊?

fresh
再比如：
We should keep the river clean (clean 在这里就是形容词）
He is sitting near the fire to keep himself warm (warm 是形容词）
要用形容词做宾补
请在客户端右上角评价点“满意”即可,

fresh 用于修饰名词air，意为“保持空气新鲜”