Translation of "School's" in Chinese

Our school's principal is very old.

我校校长很老了。

The school's tallest structure is that water tower.

学校最高的建筑就是那个水塔。

There are a lot of books in our school's library.

我们学校的图书馆藏书很多。

The school's lovely cherry blossoms drew a lot of residents to come and admire it.

学校的樱花开的烂漫，吸引了大量市民前来观赏。