Ключевые слова: alternation, alternative, change, clean, concept, concrete, cover, curtain, curtains, destruction, dirty, discovery, drapery, drapes, dream, eco, ecology, energy, environment, factory, grass, gray, hand, hope, imagination, landscape, nature, open, pollution, problem, protect, pulling, replace, reveal, rope, scene, smog, smoke, space, string, urban, white,