我看见一只乌鸦在草地上啄食。

I saw a ___crow pecking at food on the grass.

清晨，一只乌鸦在树上啼叫。

In the early morning, a ___crow was ___crowing in the tree.

他忍不住向朋友们炫耀自己考试得了满分。

He couldn't resist ___crowing about his perfect score on the test to his friends.