Answer:
A large oasis in the desert. Come with cash and leave with none. What am I?
I have keys but no locks. I have space but no room. You can enter but can't go outside. What am I?
I am the only thing that always tells the truth. I show off everything that I see. I come in all shapes and sizes. What am I?
When it comes to me, you go on red and stop on green. What am I?
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?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?