Answer:
I am as hard as metal, yet as flimsy as glass. I shine like a star, yet I am only a rock. What am I?
I always go to bed with my shoes on. What am I?
You throw me out when you use me and take me in when you are done. What am I?
What force and strength cannot get through, I with my unique teeth can do. What am I?
I stay where I am when I go off. What am I?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?