题目内容：

阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写一个适当的单词，在给出提示词的空白处用括号内所给词的正确形式填空。

Amateur explorers have found what may have been the last undiscovered island on Earth. The island is round and about three quarters of a mile wide. It sits in the northern Pacific and is a place 1. it’s neither too hot nor too cold. It’s almost completely flat and rocky. The island’s only distinguishing feature is a slight hill on the eastern side. After spotting the hidden piece of land in 2.first looked like an e-map fault, the group of friends 3.(set) out in a boat to confirm what they’d found. They’re now running an online contest to name the island.