Good Riddles

Question: I have two rings. I move by request. If the mixture isn't right I just sit and rest.

What am I?

Question: What was the calendar so cramped up and going crazy?

Question: What is as ancient as the earth but new every month?

Question: There are three words in the English language that end with the letters 'g', 'r', and 'y'. Two are "hungry" and "angry." The third word is something everyone uses every day. Everyone knows what the third word means. What is the third word?

Question: 20 people jump into an empty swimming pool but 24 heads come up. How did this happen?