有些人认为动物实验应该被禁止。

Some people believe that ___experiments on animals should be banned.

科学家们正在进行实验以测试这种新药的有效性。

Scientists are carrying out ___experiments to test the effectiveness of the new drug.

在化学实验室里，经常设立实验。

In the chemistry lab ___experiments are often set up.