Answer:
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's made of water but if you put it into water it will die?
I am a way to say goodbye to your sweetheart
My first is high my second damp my whole a tie a writer's cramp.
I am the same written forward backward and upside down.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.