Answer:
I open wide and tight I shut, Sharp am I and paper-cut fingers too, so do take care, I'm good and bad, so best beware.
Slayer of regrets, old and new, sought by many, found by few.
I hide but my head is outside.
Which word contains 26 letters but only three syllables?
I am nothing but holes tied to holes, yet am strong as iron.
What language does a billboard speak?