Answer:
In we go, out we go. All around and in a row. Always, always steady flow. When we'll stop, you'll never known. In we go, out we go.
What is full of holes but still holds water
Tall in the morning, short at noon, gone at night. But I'll be back soon.
What kind of running means walking?
What comes once in a minute, twice in a moment, but never in a thousand years?
What never gets any wetter no matter how hard it rains?