1. Read the text and fill in the gaps with appropriate words:
garbage, nuclear testing, pollution, recycling, ecology
Air, sea and land (1) ___ is one 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.

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