Подставьте слова вместо пустых мест 
This text introduces you ________ the problem of enironment. 
Now we also have _____ us the same problem 
Natural resources are used ________ purposes of home industry and agriculture 
The wide use _______ natural resources upsets the biological balance 
The people are faced __________ the problem ________ the pollution 
We all should try to do our best ______ order to make air/ forsets and soil more cleaner than before 
Ключевые слова: for, before, into, of in, with