How to closed a hole
1. from the inside of the circle insert the needle to the front loop only, draw the yarn through to the Outside of the circle and again, next front loop from the inside to the outside of the circle, pick up all the remaining stitches.
2. pull the yarn tail tight until the hole is completely closed.
3. insert the needle back to the center of the circle.
4. Pass the yarn through the piece coming out on a different side through a hole.
5. cut the yarn tail