听力原文： A Boeing 727 aircraft with 51 passengers and 10 crew on board has crashed into a mountain side just outside the Columbia capital, Bogota. Police and rescue workers said everyone was killed when the plane exploded scattering wreckage over a wide area. The crash happened shortly after take-off when the plane was unable to gain enough height to clear the mountains. The aircraft belonged to Ecuador Airline, but it had been chartered by Air France for the route from Bogota to Ecuadorian Capital, Quito. ______ people were killed during the air crash.