Long Riddles and Answers

Question: Most people are born on one, die on one, and experience some of their most blissful moments upon it.

Question: Matt's teacher asked him, "What is 3+3?" Matt answered, "8," Matt is correct. How is this possible?

Question: I like to twirl my body but keep my head up high.when I go in everything becomes tight. What am I?

Question: When you don't have me, you want me, but when you do have me, you want to give me away. What am I?

Question: It runs when I run and stops when I stop. It only works when you set it and then stop it. What am I?