根据汉语提示完成句子（每空一词）。
I want to know if yellow was once the color of the rulers in ________(古代的) China.
The news which kept ________(影响) him a lot was from a little girl.
Please put away those              (德国人) keys to cars. They are going swimming.
             (化学)is becoming closer and closer to people’s life.
We may meet all kinds of difficulties in the future, but we should be confident enough to take on any           （挑战）