There are many methods for finding answers to the mysteries of the universe, and science is only one of these. However, science is unique. Instead of making guesses, scientists follow a system ①designed to prove if their ideas are true or false. They constantly reexamine and test their theories and conclusions. Old ideas are replaced when scientists find new information ②that they cannot explain. Once somebody makes a discovery, others review it carefully before ③using the information in their own research. This way of building new knowledge on older discoveries ④ensure that scientists correct their mistakes. Armed with scientific knowledge, people build tools and machines that transform the way we live, making our lives ⑤much easier and better.
Bad lighting can increase stress on your eyes, as can light that is too bright, or light that shines ①directly into your eyes. Fluorescent lighting can also be ②tiring. What you may not appreciate is that the quality of light may also be important. Most people are happiest in bright sunshine ― this may cause a release of chemicals in the body ③that bring a feeling of emotional wellbeing. Artificial light, which typically contains only a few wavelengths of light, ④do not seem to have the same effect on mood that sunlight has. Try experimenting with working by a window or ⑤using full spectrum bulbs in your desk lamp. You will probably find that this improves the quality of your working environment.
Clothing doesn’t have to be expensive to provide comfort during exercise. Select clothing appropriate for the temperature and environmental conditions (A)[which / in which] you will be doing exercise. Clothing that is appropriate for exercise and the season can improve your exercise experience. In warm environments, clothes that have a wicking capacity (B)[is / are] helpful in dissipating heat from the body. In contrast, it is best to face cold environments with layers so you can adjust your body temperature to avoid sweating and remain (C)[comfortable / comfortably].
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