根据给定的一组英语词汇，生成一个包含这些词汇的填空题，题干可以是一段文字或一组句子。
给定的英语词汇列表（例如"happy", "blue", "fish", "water"）
题干：On a hot summer day, I sat by the ___________  and watched the ___________ swim in the crystal-clear ___________. Suddenly, I felt ___________ and decided to take a refreshing dip in the cool ___________. (词汇：water, fish, blue, happy, river)