The teacher had a look when he found that none of his students had finished his homework.

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A. shocking
(答案→)B. shocked
C. bored
D. boring
解析：考查V+ing和V+ed形容词的意思，shocking意思“令人震惊的”，shocked意思“受震惊的”，bored意思“受惊的”，boring意思“令人厌烦的”，句子意思“当老师发现他所有的学生都没有完成作业的时候老师有镇静的表情”