He is very popular among his students as he always tries to make them ______ in his lectures.
 
【正确答案】 A
【答案解析】 interest 兴趣;利息[率][pl.]利益vt.使感兴趣 interesting有趣的,引起兴趣的 interested感兴趣的,关心的 注意interest的-ing和-ed的区别