Long Riddles and Answers

Question: If a white house is white and a yellow house is yellow, what color is a green house?

Question: Take my first and make it my last, now I happened in the past.

What am I?

Question: What is in the middle of the moon, At the end of an igloo And goes round in loops?

Question: There once was a horse that won great fame. What do you think was the horses name.

Question: What has a lot to say but can't be heard because it can't speak one single word?