active

adj.①活跃的,忙碌的 ②起作用的:Listening well is an active exercise of our attention and hard work.   (江西高考)

【搭配】  be active in(doing)sth.在(做)某事方面很积极

 take an active part in...积极参加……

play an active part/role in在……中起积极作用