rule|rules

你不能在学校吸烟，这是违反规则的。

You can't smoke at school, it's against the ___rules.

学生应该始终遵守规则。

Students should always follow the ___rules.

我的高中有很多规则。

There're plenty of ___rules in my high school.

我们做了一个关于动词时态和语法规则的小测验。

We had a short test on verb tenses and grammar ___rules.

数学中的一条基本规则是，你不能除以零。

One basic ___rule in mathematics is that you cannot divide by zero.