51.   The sheer size of the classes makes learning difficult for students.

52.   The sheer size of the country makes communications difficult.

53.   The slump in the housing Market is making it difficult for people to sell their homes.

54.   The slump in the property Market is making it difficult for people to sell their homes.

55.   The somber job was made more difficult by driving snow and subfreezing temperatures.

56.   The stigma of alcoholism makes it difficult to treat.

57.   The strained atmosphere at the dinner made it difficult to chat with people.

58.   The structure of agriculture makes it difficult to treat the peasant drive for noble land as the harbinger of rural capitalism.

59.   The temperature rises with the cloud cover, and the snow underfoot becomes wet and soft, making progress difficult and tiring.