问题补充：
He is very popular among his students as he always tries to make themin his lectures.
A. interested
B. interesting
C. interest
D. to interest
答案：
(答案→)A. interested
B. interesting
C. interest
D. to interest
解析：‘make后接动词-ed形式作宾语补足语’，表示被动。根据them可interest的关系可确定用动词-ed形式作宾语补足语,表示“使他们对他的课感兴趣”。
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