peck|pecked|pecking

奶奶快速地在孙子额头上亲了一下。

The grandmother gave her grandson a quick ___peck on the forehead.

她没胃口，只是随便吃了几口沙拉。

She wasn't hungry and only ___pecked at her salad.

麻雀啄食地上的种子。

The sparrow is ___pecking at the seeds on the ground.