51.   On the defensive side, Butch Davis, in his second year, has proven his worth.

52.   On this score, the motor-voter law is proving its worth.

53.   Others say that government has proven its worth.

54.   Saturday, they were out to prove their worth to a region.

55.   Specialists trying to learn why and how the method works warn that it has yet to prove its worth in industrial processing.

56.   Spring is when Doppler radar proves its worth.

57.   Stephen Cary, whose nonviolence was rooted in his Quaker faith, had adamantly wanted to prove his worth to wartime America through alternative public service.

58.   Such control has advanced sharply in recent years for military planes and has proved its worth in Afghanistan.

59.   Such an approach proved its worth in nudging North Korea out of its shell into limited compliance with international safeguards on the production of nuclear materials.

60.   That means the burden is on you, the employee, to prove your worth and then present your case.