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The machine works according to the                  of electromagnetic conduction.

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In order to be taken away and used everywhere, modern inventions have a tendency to be small and _____.

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Blu – ray  was first commercially _______ in 2006 and it uses a blue laser to read or write data to a disc.

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The Tower Infinity in South Korea is supposed to be the world’s first skyscraper that, for a few hours a day, _______ an unobstructed view of the sky behind it.

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3-D _______ is used to produce complex tools and components.

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He drew much                 from art produced by children and by primitive cultures.

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In 1880 Alexander Graham Bell was granted a               on an apparatus for signaling and communicating called a Photophone.