Directions: Please scan the text anduse the words with corresponding capitalized lettersin the following tableto fill in the blanks.What does it mean?Instead of performing at a steady, unchanging rate, our body systems function on an approximately 25-hour1 . Sometimes we are accelerating, sometimes slowing down. We achieve peak efficiency for only a limited time each day. Physician-biologist Franz Halberg called these 2 patterns "circadian rhythms."How can it be applied?Circadian principles have been applied to astronauts' work schedules on most of the space-shuttle 3 .In order to achieve our best with the least effort, we should know our rhythms and4the demands of our activities with our biological capacities.We do our best 5work when our rhythms are at their peak. We should schedule our most demanding activities when our temperature is highest.For6activities, the timetable is more complicated. Precision tasks, such as mathematical work, are best 7 when our temperature is on the rise. By contrast, reading and reflection are better pursued when body temperature usually begins to fall.Breakfast should be our largest meal of the day for effective 8. Calories burn faster one hour after we wake up than they do in the evening.Caffeine, alcohol and medicines are processed 9at different time of day too.Knowing our rhythms can also help us overcome 10problems.