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1. Petrochemical engineers have _____ developed plastics and fine chemicals.
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2. The nuclear industry hasn't developed non-toxic energy_______.
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3. Lithium-ion batteries have revolutionized the industry ____ thirty years.
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4. Nanotechnology has been improving the different scientific sectors ______ its creation.
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5. I haven't bought an electric car _____, but my friends say it's very cheap.
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6. We have been implementing clean energies around the world _____ 1970.
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7. I have _______ installed the new solar water heater in my house.
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8. Elon Musk has been planning to take people to Mars ____ many years.
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9. Google has ____ released its new app.
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10. Apple has launched a new product _______.
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