Answer:
I make billions of dollars selling windows. Who am I?
I am the building with the most number of stories.
When you buy me I am costly, but the only use I have is hanging only. What am I?
To you, rude would I never be, though I flag my tongue for all to see. What am I?
I am alive without breath and cold as death. I am never thirsty but always drinking.
What is yours but only used by others?
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic