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Please according to the content of the document provided above, complete the following blanks.The earliest humans had access to only a very limited number of materials, those which occur naturally: ( ), wood, ( ), skins, and so on.

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Please according to the content of the document provided above, complete the following blanks.With time they discovered techniques for producing materials that had properties superior to those of the natural ones; these new materials included pottery, ( ) and ( ) and so on. Furthermore, it was discovered that the properties of a material could be altered by ( ) and by the addition of other substances.

Please according to the content of the document provided above, complete the following blanks.Tens of thousands of different materials have evolved with rather specialized characteristics that meet the needs of our modernand complex society; these include ( ), ( ), glasses, and ( ).

Please according to the content of the document provided above, complete the following blanks.Automobiles would not have been possible without the availability of ( ) or some other comparable substitute. In our contemporary era, sophisticated ( ) rely on components that are made from what are called ( ).

Please according to the content of the document provided above, complete the following blanks.Virtually all important properties of solid materials may be grouped into six different categories: （）, （）, thermal, magnetic, （）, and deteriorative.