Good Riddles

Question: Why doesn't Cinderella play softball?

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

Question: sedentary stop + sudden start = ?

Question: What didn't Adam and Eve have that everyone else has?

Question: It cannot be seen, It cannot be felt, It cannot be heard, It cannot be smelled, It lays behind stars and under hills, and empty holes it fills. It comes first and follows after, ends life and kills laughter. What am I?