用in the island还是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.他在岛上每过一天，就在手杖上刻一个新的记号。

2.Rough weather would have denied us a landing on the island, for me the high spot of the entire cruise.暴风雨天气差点使我们无法在岛上登陆，而上岛对我来说正是整个航游过程中最精彩的部分。

3.There are many different sorts of animal on the island.岛上有许多不同种类的动物。