61.   The violence is making it difficult for firefighters to carry out their work.

62.   The windy conditions made it difficult to put the tent up.

63.   This follow-up is essential in ward teaching, but poor facilities often make it difficult to achieve without interruption.

64.   This is further exacerbated by the noise in many factories which makes conversation difficult and so relationships with others are diminished.

65.   This is made doubly difficult where there is a concurrent struggle for power among vested interest groups and individuals.

66.   This made it difficult to draw conclusions.

67.   This will cause both feet to rest on the windward rail, making it difficult to keep the board level.

68.   This wind made it difficult to focus the flames of the burning tyres on precisely the right spot.