—I think everyone must do his best to pollution.—If so there will be a good future for pe

问题补充：

—I think everyone must do his best to pollution.

—If so, there will be a good future for people of tomorrow.

A. keep B. stop C. stand

答案：

解析：：此题重点考查选择项动词的含义，根据语境可知人人都要尽力阻止污染，只有这样人类才有美好的未来。故选stop。