Закончите предложения 1. … has served for almost 150 years as a key to discovering new elements and it has retained its key capacity until now. 2. His lectures were always listened to with great … 3. … began to write a great text book of chemistry, known in its English translation as "Principles of Chemistry" Hard work preceded it. Mendeleyev made thousands of experiments and calculations, wrote a lot of letters, studied many reports. 4. All those data were being brought together … 5. … earned him lasting international fame. 6. … were being brought together and grouped in a special way. 7. … serves as a basis for thousands of researches. 8. It is studied by philosophers, historians, teachers …

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