Short medium simple riddles

Every time you stand up, you lose this. What is it?

I build up castles. I tear down mountains. I make some men blind, I help others to see. What am I?

My best buddy always makes mistakes. But I would easily get rid of the mistakes. What Am I?

They are twin sisters, same height; they work in the kitchen, arm in arm. Whatever is cooked, they always try it first.

You have to look at me to say what I show you. I offer two different purposes but I am spelled the same and I am pronounced the same.

You measure my life in hours and I serve you by expiring. I'm quick when I'm thin and slow when I'm fat. The wind is my enemy.

Never trust this fellow’s grin. His teeth are sharp and course, his blood’s as cold as icicles, and he’ll show no remorse! What is it?

I am a fruit. Remove my first letter, it's a crime. Remove my first and last letter, it's a kind of music. What do you think am I?

What am I?

Poke your fingers in my eyes and I will open wide my jaws. Linen cloth, quills, or paper, I will devour them all. What am I?