Answer:
What is always in front of you but can't be seen?
Always in you, sometimes on you. If I surround you, I can kill you. What am I?
What can you catch but not throw?
I'm very tempting so its said I have a shiny coat of red and my flesh is white beneath. I smell so sweet taste good to eat and help to guard your teeth.
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?
Give it food and it will live, give it water and it will die.