Tow Truck
I am the reason you run. I am the reason you scream. I am the cause of your pain. I am a cage from which you will never be free. What am I?
When united they stand, Perhaps I cause debt. Give me a stone, And I will be set. I can be in your ears, Or on threm as well. You come to my call; I'm the voice of a bell. What am I?
I am a type of vehicle that has two wheels and is powered by humans. What am I? Hint 1: You can ride me for exercise. Hint 2: I am environment-friendly.