He is very popular among his students as he always tries to make them in his lecturesA.

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(答案→)A. interested
B. interesting
C. interest
D. to interest
解析：句意：他在学生中很受欢迎，因为他总是让学生们对他的演讲感兴趣。make sb. + adj.的用法，此题考查make后加形容词形式，根据空格前的them可判断和interested形成逻辑关系。另外interested in 意思是：对… …感兴趣。故选择A。
考点:考查非谓语动词做宾语补足语的用法。