分词作定语与状语 — 英语填空题
题目
用所给动词的适当形式（分词）填空：The island, ___ (surround) by clear waters, is home to many rare species. ___ (Face) with the loss of their habitat, the birds have flown to a safer area. Scientists found a track ___ (lead) deep into the forest, ___ (leave) behind by an unknown animal.