Good Riddles

Question: i am boiling hot and freezing col at the same time what am i?

Question: i can fill up the entire room and still not take up any space. Who am i?

Question: What is 50% divided by 2?

Question: A man who couldn't speak went into a store to buy a toothbrush. He pretended to brush his teeth with his finger to tell the cashier what he wanted. The cashier understood and the man went home with the toothbrush. Then, a blind man came into the store wanting to buy sunglasses. How could he tell the cashier he wanted sunglasses?

Question: why is six scared of nine