根据句意和汉语提示，用正确的单词填空。
People all over the world love __________(和平).
The young man is trying to be a     (先锋) in the field of high technology.
When the star     (出现) on the stage, the fans all screamed excitedly.
Look !There is a beautiful               (彩虹) in the sky. It’s colourful.
He made a sudden______________(决定).