Good Riddles

Question: You are trying to get your chicken, fox, and wheat to the barn. However, the barn is on the other side of the river. You are on a boat and can only transport one animal or wheat at a time. You must choose carefully not to leave the wrong two together, though. It's either the fox will eat the chicken or the chicken will eat the wheat. How do you take each thing across safely?

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

Question: Which gate can you not go through?

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

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

What am I?