آزمون آنلاین زبان انگلیسی 2 - زبان انگلیسی 2 | آزمون شماره 5943

The government is expected to take effective ......... to save the environment from the danger of destruction.

English is the mother ……… of around 20 percent of the world's population.

It is said that a man’s worth ……… on his two smallest organs: his heart and his tongue.

Why does the author use “clean” in the passage? 

C-