category

我属于认为社会需要动物园的那一类人。

I belong to the ___category of people who think that society needs zoos.

在数学中，实数属于一个特定的分类。

In mathematics, real numbers belong to a specific ___category.

在英语中，'run'属于动词这一词类。

In English, 'run' belongs to the verb ___category.