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What about diamonds ?

Each sentence is followed by three choices which could be used to complete the sentence. Decide which of these choices is the correct choice to complete the sentence, and click on the correct answer.
 

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English exercise "What about diamonds ?" created by sidou77 with The test builder. [More lessons & exercises from sidou77]
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1. Diamond is the hardest metalsubstancematerialI don't know known to man.

2. Diamonds come in many colours but clear diamonds, known as white diamonds, are slightlynearlyextremelyI don't know valuable.

3. They are made byofamongI don't know a mineral form of carbon.

4. One of the main fountainsplacessourcesI don't know of diamonds is South Africa.

5. Before the discoverymeetingthe inventionI don't know of diamonds in Africa, the only location in which they had been found was India.

6. As diamond is so hard, it is often used inatforI don't know cutting.

7. The word diamond getscomestakesI don't know from the Greek word 'adamas' which means invincible.

8. The largest diamond was found in a mine in South Africa atoninI don't know 1905.

9. However, diamonds have to be cut to producedevelopfabricateI don't know the crystal forms that we know.

10. The Crown Jewels in London containmakeexistI don't know some of the largest and most valuable cut diamonds in the world.