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1. Facebook was built on the __________ of earlier social network sites like MySpace and Bebo.

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2. It is thought that driverless cars will transform the way we move __________ cities in the future.

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3. Little Pascal __________ a mechanical calculator which could do additions or subtractions very quickly.

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4. Robots save workers from __________ dangerous tasks.

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5. Many people believe that robots have made workers jobless, ___________ that is not necessarily true.

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6. Recent __________ developments have made robots more user-friendly, and intelligent.

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7. Teenagers spend most of their time playing computer games; __________, they lose their interests in daily activities.

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8. Science and technology have __________ the life safe, secure and comfortable.

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9. Terrorists are using modern technology __________ their destructive work.

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10. With the advance of the science and technology, our life changes greatly in various __________.

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11. An astronaut has to wear a spacesuit __________ it may be very cold in space.

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12. The UFO landed on a __________ area.

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13. Scientists have been trying to find __________ of aliens.

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14. There have been many UFO __________ reported.

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15. Mars is called the Red Planet due to its __________ surface.

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16. In the mid-19th century, scientists discovered that Mars had some similarities __________ Earth.

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17. Neptune is bright blue __________ it is named after the Roman God of the sea.

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18. There is a lot of interest in doing experiments in the __________ conditions.

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19. Titan, one of Saturn's __________, has a thick atmosphere.

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20. Scientists believe that Mars also __________ seasons just as the Earth does.