Answer:
People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?
Who plays when he works and works when he plays?
I bring light to a dark world. In a current I travel and through tunnels I am hurled. Touch me and I'll kill you. What am I?
I begin with the letter āiā, if you add āaā in front of me, I become a new word with a different meaning, but still sounds exactly the same. What word am I?
A thousand wheels, but move I do not. Call me what I am, call me a lot. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.