1. Read the text and fill in the gaps with appropriate words
garbage, nuclear testing, pollution, recycling, ecology
Air, sea and land (1) ___ is on of the biggest problems of our time. We produce a lot of (2) ___
during our lifetime and we need to get rid of it. One solution to this problem is (3) ___. (4) ___
is the science that studies the environment. Ecologists know that (5) ___ is very dangerous for
the environment.​