Answer:
I go up and down at the same time. Up towards to sky and down towards the ground. What am I?
I begin your sentences.
I turn everything around, but I cannot move. When you see me, you see you! What am I?
My first is second in line; I send shivers up your spine; not quite shining bright I glitter in the light.
My first though water cures no thirst my next alone has soul and when he lives upon my first he then is called my whole.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.