If you say my name, I will no longer exist. What am I?

I have an eye but still cannot see.

Who am I?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What 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?

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

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?

If six children and two dogs were under an umbrella, how come none of them got wet?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

Can you find the missing piece of the Porsche?

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?