Answer:
I can fly but I have no wings. I can cry but I have no eyes. Wherever I go darkness follows me.
Against the sun I protect your eyes and am often worn on the face of spies
I am easy to waste and unstoppable. What am I?
I am whole but incomplete. I have no eyes, yet I see. My largest part is one fourth of what I once was. What am I?
I am bought by the yard but worn by the foot. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.