41.   In laboratories, fetal-tissue transplantation has not proved as practical or promising as once promoted, and many researchers now call the political debate moot.

42.   In recent years, the company has said it is interested in a strategy involving limited investments in new electronic media enterprises until they prove themselves as financially viable.

43.   In short, he has yet to prove himself as a championship quarterback.

44.   In the stormy love affair that develops, Jack, who is H.I.V.-negative, proves as needy and vulnerable as Tonio.

45.   It shows me I still have a lot of things I have to prove as a player.

46.   It proved as much Thursday.

47.   Kennedy had proven himself as a scholar, a prize-winning writer, a war hero, a bold leader and a visionary.

48.   Last season proved as much.

49.   Like Bush, Fox has proven as skilled at speaking to average folks as to world leaders, appearing to stay in touch with his ranching roots.

50.   Larry Bird, legendary Boston Celtics forward, gets a chance to prove himself as a playoff coach.