这个实验清楚地证明了空气污染对植物的影响。

The experiment ___demonstrates the impact of air pollution on plants clearly.

学生们计划明天在校园里集会，抗议学费上涨。

The students plan to ___demonstrate on campus tomorrow against the tuition hike.

老师通过实际操作向我们演示了如何解这道数学题。

The teacher ___demonstrated how to solve the math problem by actually doing it.