Answer:
I can be written, I can be spoken, I can be exposed, I can be broken.
It cannot be seen, cannot be felt, Cannot be heard, cannot be smelt. It lies behind stars and under hills And empty holes it fills. It comes first and follows after, Ends life, kills laughter.
Left to right I’m quite bright. Right to left I might bite.
What has four legs during the day; and six or eight during the night?
Although my cow is dead, I still beat her. What a racket she makes!
What covers its face with its hands, speaks no language, yet most known what it's saying?