Answer:
I go through a door but never go in and never come out.
I am whole but incomplete. I have no eyes yet I see. You can see and see right through me. My largest part is one fourth of what I once was.
I am what one cannot keep, two cannot hold, and three cannot destroy. What am I?
What has 3 feet but no toes?
I can run but not walk. Wherever I go thought follows close behind.
What language does a billboard speak?