他正在进行一项重要的实验。

He is conducting an important ___experiment.

他们做了一个实验来验证这个理论是否正确。

They conducted an ___experiment to verify if the theory was correct.

我想尝试用不同的学习方法，看看哪种效果最好。

I want to ___experiment with different study methods to see which works best.

学校正在尝试新的教学方法。

The school is conducting an ___experiment with new teaching methods.