21.   As I placed the nozzle into my fuel tank, I looked to the north and noticed this coal black cloud hovering over the power plant.

22.   Black clouds from decades of steel production coated men, buildings and beasts.

23.   Black clouds boil overhead as the vehicles thrum restlessly.

24.   Black clouds knuckle against the hills.

25.   Black clouds rolled out of the southwest, bringing lightning, thunder, hail, high winds and violent rains.

26.   A black cloud just hung over me.

27.   A black cloud loomed over the light and festive Winter Carnival.

28.   A little black cloud hangs over the head of just about every man imaginable.

29.   A storm cell is gathering to the north, ugly black clouds stacking one on top of another.

30.   After hours of debate, they decided to approve the first burn to minimize a spill, calling the vast black clouds of pollution a necessary trade-off.