He is a strict but kind teacher, is always trying to make his classes and interesting . A

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A. one ; living
(答案→)B. one who; lively
C. he ; lovely
D. he who; live
解析：考查同位语和形容词用法。本题第一空的one与前面的名词a strict but kind teacher构成同位关系，都是泛指。Lively生动的；Lovely可爱的；living活着的；live现场直播的；活着的（动物）；句意：他是一个严厉但是很善良的老师，一个总是让他的课堂生动活泼的老师。故B正确。