Question

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Diamonds are nature's hardest things,rase and expensive .Man-made diamonds provide a ___(cheap) and more readily available solution.Recent breakthroughts have brought methods to mass produce synthetic gems for both the jewelry industry and for technology,but ___history of man-made diamonds is over a hundred years old.
Man-made diamonds come in two types.They are synthetics,___have the same chemical composition and structures___diamonds,and simulants,which are of different materials,but appear diamond-lik and have some of diamond's features.
The first man-made diamnds in history were of the simulant type___(make) by Dr.henri Moissan in 1893.Later,many scientists made new___(discover)of man-madediamonds.Recent breakthroughts in synthetic diamond"growth"___(enable) some smaller companies to enter the market for man-made diamonds.
___is intereting to note that throught the history of man-maed diamonds,the purpose to produce them was for use in technology.For many,the intention was___(aid) science.The resulting gems are___(simple) a happy and money-making accident

Answer 1

Diamonds are nature's hardest things,rare and expensive .Man-made diamonds provide a __CHEAPER_(cheap) and more readily available solution.Recent breakthroughts have brought methods to mass produce synthetic gems for both the jewelry industry and for technology,but _THE__history of man-made diamonds is over a hundred years old.
Man-made diamonds come in two types.They are synthetics,_WHICH__have the same chemical composition and structures_FOR __diamonds,and simulants,which are of different materials,but appear diamond-lik and have some of diamond's features.
The first man-made diamnds in history were of the simulant type_MADE__(make) by Dr.henri Moissan in 1893.Later,many scientists made new__DISCOVERIES_(discover)of man-madediamonds.Recent breakthroughts in synthetic diamond"growth"__HAVE ENABLED_(enable) some smaller companies to enter the market for man-made diamonds.
_IT__is intereting to note that throughOUt the history of man-maed diamonds,the purpose to produce them was for use in technology.For many,the intention was__TO AID _(aid) science.The resulting gems are_SIMPLY__(simple) a happy and money-making accident

Answer 2

Diamonds are nature's hardest things,rase [should be "rare"] and expensive .Man-made diamonds provide a _cheaper__(cheap) and more readily available solution.Recent breakthroughts have brought methods to mass produce synthetic gems for both the jewelry industry and for technology,but _the__history of man-made diamonds is over a hundred years old.
Man-made diamonds come in two types.They are synthetics,_that__have the same chemical composition and structures__of_diamonds,and simulants,which are of different materials,but appear diamond-lik and have some of diamond's features.
The first man-made diamnds in history were of the simulant type__made_(make) by Dr.henri Moissan in 1893.Later,many scientists made new_discovery__(discover)of man-made diamonds.Recent breakthroughts in synthetic diamond"growth"_have enabled__(enable) some smaller companies to enter the market for man-made diamonds.
_It__is intereting to note that through the history of man-made diamonds,the purpose to produce them was for use in technology.For many,the intention was__aided_(aid) [这里有点不清楚] science.The resulting gems are_simply__(simple) a happy and money-making accident