Answer:
I can be written, I can be spoken, I can be exposed, I can be broken.
Come up and let us go. Go down and here we stay
I climb higher when hot, But beware my rage, I’ll kill with a breath, If I can escape my cage
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
I can move even when you are still. I can be one or many.
People take me on walks and I run and have fun. What am I?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?