这是一个测试句。

This is a ___test sentence.

他仔细地观察着试管里的液体。

He is carefully observing the liquid in the ___test ___tube.

明天我们有一场数学测验。

We have a math ___test tomorrow.

这次期末考试是对我们学习能力的一次真正考验。

The final exam was a real ___test of our learning abilities.

我们需要测试这台新机器是否运转正常。

We need to ___test the new machine to see if it works properly.