题目内容：

阅读下面材料，在空白处填入适当的内容(1 个单词)或括号内单词的正确形式。

On April 22nd, the UNEP(United Nation Environment Programme) called for increasing protection of Antarctica, 1.is the world’s most southern continent. 2.(scientist) say climate change and human activity have 3.(increasing) led to the melting of massive pieces of Antarctic ice. Not only is the disappearance of ice affecting wildlife 4.the area such as seals and penguins, but also causing oceans and seas around the globe 5.(rise).

This leads to an even 6.(big) threat to coastal cities. For instance, Venice, an ancient city of Italy, has long been threatened by the rising sea levels. So far, this situation 7.(make) worse by the fact that its ancient houses 8.(build) on a body of water are slowly sinking. In addition, the salty water is also destroying both famous buildings 9.priceless artworks of Venice. Therefore, it’s high time that action should be taken to fix 10.serious problem.