Short difficult clean riddles for teens

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.

I have just one, but with eight to spare, I am usually friendly, but I sometimes act like I don't care. What am I?

I build bridges of silver and crowns of gold. Who am I?

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.

I look taller when I am young. But as I get old, I become shorter and shorter. What Am I?

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 goes up and doesn’t come back down?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?