1.   It it has to be the most difficult sell in the world selling selling a piece of blank space.

2.   Analysts said, however, that in this case it could have been a difficult sell.

3.   Analysts, however, said that in this case it could have been a difficult sell in Congress.

4.   Baseball or no baseball, Shelton is well aware that he has a difficult sell on his hands.

5.   But the country is still a difficult sell.

6.   But this has not been a difficult sell.

7.   Irwindale was the first race track in Southern California to offer Friday night racing, but it proved a difficult sell to fans and drivers alike.

8.   It proved a difficult sell.

9.   It was a difficult sell, and he used all of his celebrated skills of persuasion.

10.   It was not a difficult sell, Ms. Skriba said.