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Fill in the words from the list below. Use each word only once.
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electricity, common, elements, melting, development, large, extent
1. the world's most ….. metal
2. comparatively large …..
3. classification of the ….. groups
4. reasonably ….. quantities
5. comparatively high ….. point
6. good conductors of heat and …..
7. cultural stages in human …..
7. Read the text and fill in the gaps with the words from the list below. Use each word only once:
metal, important, century, obtain, useful, brass, alloys, copper, environment
It is only since the time a man had learnt how to 1) _______ and use metals and their 2) _______, he has been able to adapt his 3) _______ to his needs and desires. The present age is, in fact, the Age of Metals and it is 4) _______ that we should have some acquaintance with these 5) _______ substances. In the ancient times, gold, silver, 6) _______, tin, iron, lead and mercury were known as " The SevenMetals".
One other 7) _______, zinc, has also been known in its role as one of the constituents of the alloy 8) _______. Almost no metals other than these seven or eight were known until the eighteenth 9) _______ and many that we use today, not until the nineteenth.
8. Read the clues and complete the crossword:
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