Answer:
I am good at concealing what's real and hide what's true. Sometimes I bring out the courage in you!
In a tunnel of darkness lies a beast of iron. I can only attack when pulled back. What am I?
I have a tongue, but cannot speak. I have a bed but cannot sleep. I have four legs but cannot walk. Yet I move as you do. What am I?
Taken from a mine and then locked up in a wooden case. I am used by students everyday.
If you have me, you want to share me. Once you share me, you won't have me. What am I?
I'm a god. I'm a planet. I measure heat.