Завдання : вставити правильні слова

( garbage,nuclear testing,pollution,surface,recycling,

ecology)

1.Air,sea and land….is one of the biggest problems of our time.

2.We produce a lot of….during our lifetime and we need to get rid of it.

3.One solution to this problem is……

4……is the science that studies the 

environment.

5.Ecologists know that … … is very