71.   But several Pentagon officials say the driving force behind the Osprey has always been the Marines.

72.   But teens are not the only driving force behind new youth programs.

73.   But the driving force behind this kind of violence, several specialists agreed, is what children learn about what behavior is permissible.

74.   But the biggest force behind the gene therapy wave, some say, has been biotechnology companies.

75.   But the driving force behind the enterprise is Ms. Murkoff.

76.   But the major driving force behind the shift, say political scientists, is suburban sprawl and the conservative attitudes it spawns.

77.   But, make no mistake, the players were the driving force behind this decision, as they should have been.

78.   Carleton was considered the moving force behind the new career awareness camp in Fishkill, which seeks to guide disadvantaged adolescents toward educational achievement and the workplace.

79.   Clinton was a major force behind the effort to transform APEC from a diplomatic forum into a vehicle for dismantling trade barriers.

80.   Cohabitation is also the driving force behind the soaring rate of children being born out of wedlock.