What has one letter and starts with an E?

The dirtier I get, the whiter I look. Who am I?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

Which point will the car reach to go out?

What breaks yet never falls, and what falls yet never breaks?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

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.

I am dry when I go inside, but wet when I am pulled outside.
The longer I am inside, the stronger I get
When I am completely out, I am wet and I literally sag
Who am I?

If an electric train is travelling south, then which way is the smoke going?

How can you write nineteen in a manner that if we take out one, it becomes twenty?