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For thousands of years, stone, wood, and animal skin had been the basic materials used by ancient civilisations for house building, ship construction or producing elementary tools. However, the first synthetic products which APPEARED in the 19th century were MANUFACTURED of cellulose and very quickly gained PRAISE replacing their heavy, less durable and antiquated counterparts. The commercial success of celluloids has become even more conspicuous in the 20th century as dozens of new APPLICATIONS for plastic goods have been invented. Nowadays, life without celluloid dishes, synthetic furniture and garments as well as other manifold polimeric products would be UNIMAGINABLE. What makes them so favoured and common a merchandise are their exceptional STURDINESS. Besides being _ _ S _ _ _ _ _ _ (7) to mechanical damage they have outstanding thermal and electrical insulation properties and certain kinds of synthetic products _ _ D _ _ _ _ (8) the process of a fast biodegradation, which makes them environment - _ _ _ _ _ _ _ Y (9). In addition, the cost of the production of plastic is relatively low. Hence, the polimeric _ _ T _ _ _ _ S (10) are being churned out for use of the packaging, motor, construction, aviation, medical and many other industries. Recycling as a means of _ E _ _ _ _ G (11) with this massive plastic waste is easy and effective, too. Thus, one may safely assume that our _ _ _ _ N _ _ _ _ _ (12) on synthetic materials will never end.