How to use "sheet" in a sentence

The cold spell won't last." He squinted into the smaller room, where the boy lay motionless on a hospital bed, under a white sheet and yellow blanket, trailing monitor wires

The first two clanged through sheet metal, but the third punctured the right front tire.

His head was still covered, and on his desk lay a typewritten sheet of paper, which I picked up

Then the noise stopped and a sheet of paper came under the door