Answer:
I begin and have no end. Eventually I will be the end of all that has begun.
With three leaves, I am just a plant. Add another leaf and everyone will want me for good luck. What am I?
I jump when I walk and sit when I stand. What am I?
I am black when you buy me, red when you use me. When I turn white, you know it's time to throw me away. What am I?
What is black when you buy it, red when you use it, and gray when you throw it away?
A little house full of meat, no door to go in and eat.