Best short medium riddles

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.

Which reindeer loves to go to outer space?

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

What starts with a 't' ends with a 't' and is full of 't' ?

What man cannot live inside a house?

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?