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1. I don't think people should be allowed to perform experiments ________ animals.
2. There was an explosion in technology ________ the beginning of the 20th century.
3. Let's face ________ - we are destroying the environment and we need to do something now.
4. The distance from the Earth to the Sun is, ________ average, about 149 million kilometres.
5. It's amazing that creatures survive ________ the bottom of the ocean.
6. Fox Talbot ________ the first photograph in 1835.
7. Researchers have ________ to the conclusion that your personality is affected by your genes.
8. Do you mind if I just ________ a quick phone call from here?
9. Many lives were saved ________ the introduction of antibiotics.
10. The ________ of the nuclear accident is still unknown.
11. My father works at the university, doing research ________ weather control.
12. The telescope will photograph distant galaxies, ________ an attempt to understand their past.
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