Good Riddles

Question: What is tall and have 4 legs

Question: You were asked to label the light switches for your company. You are in a room, with unlabeled light switches. There are 3 of them, and there are 3 lightbulbs in the next room. You can not travel back and forth. How do you successfully label the lightbulbs???

Question: what is ready when you add a letter inside?

Question: I'm not dead i'm not alive, i'm not underground i'm high up in the sky, people speak of me but never saw me. Who am i?

Question: i have a house but it doesnt have a door?