The old man is please keep quiet. A. sleep, and B. asleep, soC. sleepy, but D. sleeping,

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A. sleep, and
(答案→)B. asleep, so
C. sleepy, but
D. sleeping, but
解析：词义辨析。Sleep动词，睡觉；asleep,形容词，睡着的； sleepy形容词，困乏的。And和，并且；so 因此；but但是。句意：这个老人睡着了，请保持安静。故选B。