Перепишите след. предложения; подчеркните в каждом из них глагол-сказуемое и определите его видо-временную форму и залог. a) 1. today scientists are still looking for the substance as a source of energy. 2. the mendeleyev system has served for almost 100 years as a key to discovering new elements. б) synthetic rubber products were developed between 1914 and the 1930s. 2. the intensity of this process is influenced by many factors.

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