I could hear a groan of pain coming from his room.

The structure of the vocal tract is very important in forming human voices.

He said it under his breath, suppressing his anger.

I heard a dog's bark from nearby.

I could hear the dog's howling all night long.

Whose animal was the crying voice that I heard in the middle of the night?

I heard a cat's cry in the middle of the night.

His high-pitched voice echoed throughout the room.

Only the sound of rowing a boat echoed on the lake.

The sound of rowing a boat on the lake is very calming.