| II. Translate the following sentences into your native language:
1. The metals which are mined in the native state need very little refining to make them useful.
2. Platinum is mined in the native state. It needs very little refining.
3. Coke-oven gas is obtained as a by-product which burns with colorless flame and develops very high temperatures.
4. The iron and steel which are produced at our plant are of high purity.
5. The processes that were discussed are of great importance for the country’s industry.
6. The gas which has been generated is collected in the laboratory.
7. We use various grades of copper for engineering purposes.
8. Chemists can convert chemical energy into heat.
9. Ancient people have used bronze since the prehistoric times.
10. Metallurgists extract aluminum from rock with high alumina content.
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