学生们正在计算机实验室里工作。

The students are working in the computer ___laboratory.

许多重要发现都是在研究实验室里完成的。

Many important discoveries are made in research ___laboratories.

我在学校，在实验室里的时候把它弄丢了。

I was in my school, in a ___laboratory, when I lost it.