The air in Dongying is much worse than that in many other cities. We must do to protect ou

问题补充：

The air in Dongying is much worse than that in many other cities. We must do to protect our environment.

Anothing

B. anything

C. something

D. everything

答案：

A. nothing

B. anything

(答案→)C. something

D. everything

解析：句意:东营的空气比很多其他的城市还要糟糕，我们必须做点什么来保护我们的环境。nothing什么也没有，没什么事；anything 任何事；something 某事，一些事；everything每件事。根据句意可知，我们必须做点事情来保护环境。故选C。