11.   That is a difficult sell for someone who admits he is a silent loner.

12.   The staff realizes, though, that the event might be a difficult sell, because the chorus of criticism has grown louder over the years.

13.   To philanthropies, classical music is an increasingly difficult sell.

14.   That makes for a difficult sell, but one that Gordon Davidson, artistic head of the Taper, said was worth the time and expense.