71.   Thirty degrees below zero is considered a normal temperature, and thick black clouds of coal exhaust leave the brittle tundra snow gray.

72.   This black cloud had a silver lining, though.

73.   UAL Corp., Northwest Airlines Corp. and other airlines flying between the U.S. and Asia may have found a silver lining to the black cloud hanging over Asian economies.

74.   We are living under a black cloud.

75.   What the Americans were not so excited about was the black cloud that followed them home.

76.   When I was with Detroit, we were the black cloud hanging over Chicago.

77.   When the ceiling gave way, a black cloud of cockroaches came down with the plaster.

78.   While oil prices have surged in recent weeks amid robust demand and lean inventories, traders said the black cloud that still hangs over the market is Iraq.

79.   Witnesses spoke of a light dropping swiftly from the sky and then either one or two bursts of flame and an enormous black cloud.

80.   A huge black cloud covered the Lebanese capital while the tanker burned.