shore的復數形式是什么

　　例句：

　　1、He swam to the shore against a strong current.

　　他逆著急流游向岸邊。

　　2、Huge waves were breaking on the shore.

　　巨浪拍打著海岸。

　　3、What brings you to these shores?

　　是什么把你帶到這個國家來的？