洁白的鸽子在蔚蓝的天空中飞舞。

The pure white ___pigeon flutters in the blue sky.

公园长椅上落着一只灰色的鸽子，正在梳理它闪亮的羽毛。

A gray ___pigeon with shiny feathers is sitting on the park bench.

那个骗子把老人当成容易上当的笨蛋，骗走了他的积蓄。

The con artist treated the old man like a ___pigeon and tricked him out of his savings.

他训练了几只信鸽用来传递重要的信件。

He trained several ___pigeons to deliver important letters.