Answer:
I run cold and hot, I look blue but am red. What am I?
What instrument can you hear but never see?
It flavors your food and divides the year up. What is it?
What body part is pronounced as one letter but written with three, only two different letters are used?
It can be used onstage or to express admiration. What is it?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.