One day a pilot and three people were in a plane. When the plane was flying in the sky, there was something wrong with it. The smoke  was everywhere in the plane. The pilot told the people there were only three parachutes . They all became worried. "I must go because I'm the best pilot in the world." said the pilot, then he jumped out with one parachute. The next person said, "I must have a parachute. I am a very clever person, and I have to take part in an important meeting." he jumped out with another parachute. Two men were left, an old businessman and a young mountain climber. By this time the plane was going down faster and faster. The businessman said, "Young man, I am old but you're still young. You take the last parachute. " The young mountain climber smiled, "Don't worry, we are both safe, because there are still two parachutes. The clever person jumped out with my backpack." All the people became worried because  _  .
they couldn't find the parachutes there were only three parachutes,but there were four people in the plane. There was too much smoke and they couldn't jump out from the plane. They saw the pilot jump out first