Answer:
You write on me and secrets I can keep in places never seen. I spin like a top. Though stiff as a board, I'm often described like a mop. What am I?
What has four wheels and flies?
I have two bodies joined together as one. When standing still, I run and run. What am I?
I give people a huge fright but at the end I'm sweet. I normally celebrate at night when there's less heat.
I am a word. I become longer when the third letter is removed.
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.