她的研究清楚地证明了这种新方法的有效性。

Her research ___demonstrates the effectiveness of this new approach.

学生们在校园里游行，示威要求更公平的考试制度。

The students were ___demonstrating on campus, demanding a fairer examination system.

教练正在向大家演示如何正确使用健身器材。

The coach is ___demonstrating the correct way to use the gym equipment.