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

问题补充：

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

A. one ; living

B. one who; lively

C. he ; lovely

D. he who; live

答案：

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。