Short difficult simple 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.

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 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?

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?

If you see a bird sitting on a twig, how could you get the twig without disturbing the bird?