Tom, Sam, Jim and Jack live in a building ______ four floors. They live on different ______ . They have different jobs an engineer, a worker, a teacher and a doctor. Tom ______ above Sam, but below Jim. Jack lives on the ______ 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 live ______?
1．A. to B. at C. of
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