John was ten years old and he was very lazy. He had to go to school, of course, but he was bored there and tried to do as little work as possible. His father and mother were both doctors and they hoped that he would become one, too, when he grew up. But one day John said to his mother, "When I finish school, I want to become a garbage collector." "A garbage collector?"his mother asked .She was very surprised."That's not a pleasant job. Why do you want to become a garbage collector?" "Because then I'd only have to work one day a week,"John answered. "Only one day a week?"his mother said,"What do you mean?" "Well,"John answered,"I know that the ones who come to our house only work on Wednesday, because I only saw them on that day." John hoped to be a garbage collector because  _  .
he knew it was an important and necessary job he thought he would work only one day a week he often saw some garbage collectors come to his house the garbage collectors really work only one day a week