short|shorter|shortest

我们牛奶不够了；你能买一些吗？

We are ___short of milk; could you buy some?

我哥哥更高，但我比较矮。

My brother is taller, but I am ___shorter.

她的头发比之前短多了。

Her hair is much ___shorter than before.

在所有学生中，莉莉的头发最短。

Among all the students, Lily has the ___shortest hair.