Thanks to the measures ______ by the local government , the polluted river is becoming clearer andclearer and fish have begun to show up in it[ ]

This is a key. It’s ___________blue key.

I looked through it to get a(n) _____impression of the article. [ ]

下列标点符号使用不正确的一项是

There________no strong earthquake in the area in the near future, people have no fear in mind．