<prompt> Ngwala go tšwela pele bakeng sa serapa se - Gerhardt gape o thopile dimetale tše hlano go FIBT World Championships ka gauta e meraro Banna ba babedi: 1981  <response>: , banna ba bane: 1977, 1981, e tee ya silifera banna ba bane: 1979, le e tee ya bronze banna ba bane: 1978. 