用in the island還是on the island

是on the island，例如：

1、For each day he spent on the island， he cut a new notch in his stick.他在島上每過一天，就在手杖上刻一個新的記號。

2、Rough weather would have denied us a landing on the island， for me the high spot of the entire cruise.暴風雨天氣差點使我們無法在島上登陸，而上島對我來說正是整個航遊過程中最精彩的部分。

3、There are many different sorts of animal on the island.島上有許多不同種類的動物。