Задание 2 к тексту "Pollution"

Составьте предложения, используя данные слова и словосочетания:

 

1.Sciences; is based on; physics, chemistry, biology, geography ; as ; ecology; such; modern ; and others.

2.Pollution ; not only ; water ; is harmful ; to fish, animals, birds ; as well ; to people ; but.

3.Essential ; water ; civilization ; is ; material ; the most ; of ; considered to be.

4.Have ; factories ; all ; purification ; large ; systems.