清晨，一只蓝知更鸟在花园里欢快地歌唱。

In the morning, a ___bluebird sings cheerfully in the garden.

清晨看到一只蓝鸟停在窗台上，我觉得今天会有好运。

A ___bluebird perched on my windowsill this morning, which made me feel today would bring good luck.