Science 10, Fill in the blanks PLEASE?

an early internal combustion engine invented by Philip Lebon ran on _coal gas , which was ignited by a(n) electric spark . This engine was found to be too weak to operate any attached _machine__ and Eugene Langan increased the engine power by having the engine _compress___ the air fuel mix before ignition. The later engine designed by _Gottlieb daimler__ used _gasoline__ instead of __kerosene_____ as a fuel, making it even more powerful.