Answer:
At night I come without being fetched, and by day I am lost without being stolen. What am I?
Keep doing me to avoid lens dryness
I have no voice but I can teach you all there is to know. I have spines and hinges but I am not a door. Once I've told you all, I cannot tell you more. What am I?
My first is in window but not in pane. My second's in road but not in lane. My third is in oval but not in round. My fourth is in hearing but not in sound. My whole is known as a sign of peace. And from noah's ark won quick release.
I build up castles. I tear down mountains. I make some men blind, but I help others to see. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.