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Past Passive
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The invisible rays created an image when they ______ (project) onto a film.
were projected
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X-rays ________ (discover) in 1885 by German scientist Wilhelm Conrad Rontgen.
were discovered
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The rays _____ (not stop) by thick paper, or by the bones in his hand.
weren't stopped
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X-rays ___________ (first use) in a hospital only two months after the discovery.
were first used
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They ________ (not understand) until later.
weren't understood
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Rontgen __________ (give) the first ever Nobel Prize for physics in 1901.
was given
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