crow|crowing|crows

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.

我看见几只乌鸦在田野里啄食谷物。

I saw several ___crows pecking at the grains in the field.