完型填空。
Tom, Sam, Jim and Jack live in a building1four floors. They live on different 2. They have different jobs—an engineer, a worker, a teacher and a doctor. Tom 3 above Sam, but below Jim. Jack lives on the 4 floor. The doctor lives above the teacher, but below the worker. The engineer lives on the ground floor. What are their jobs? Which floor does each of them live5?