1.   A composite building of steel plus concrete is extremely difficult to achieve in New York City.

2.   A delicate plant, the Pinot Noir is difficult to nurture through the freezing cold winters of Champagne.

3.   A fair comparison between the two firms is extremely difficult.

4.   A large house is difficult to keep clean.

5.   Academic libraries Meaningful standards for academic libraries are particularly difficult to devise, because of the wide disparity of existing libraries.

6.   Adjustment was difficult and the transition from a rural to an inner-city setting was hardest for women.

7.   After this accident, it will be difficult for the government to persuade people that nuclear power stations are safe.

8.   All of our great leaders have had reputations for being difficult to work with.

9.   All parties suffered, yet it was difficult to generate a whole lot of pity for any of them.