I don't get anymore wetter, no matter how much rain falls on me.

What demands an answer, but asks no questions

John was piloting a plane behind a car but was never able to overtake it. Why?

What has one letter and starts with an E?

The more you take me, the more you leave me behind.
Who Am I?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

I make two people out of one. What am I?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. 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.