5. Complete the sentences with the words. scientific, soil, lived, environment, progress, serious, political, ozone, harmony, hundreds научный, почва, жил, окружающая среда, прогресс, серьезный, политический, озон, гармония, сотни Some _______ of years ago people _______ in _______ with nature. We live in the age of the _______ and technological progress. This _______ gave birth to the problem of _______. There are very _______ problems. They are pollution of water, _______ air, _______, the greenhouse effect, the destroying of the _______ layer, the global warming. People have to protect the nature. The protection of natural resources and wildlife is becoming a _______ programme in every country.