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     The brain is one of the most amazing (amaze) organs in the human body. It controls our         (center) nervous system,           (keep) us walking, talking, breathing and thinking. It is also the          (much) complicated organ. Several           (differ) fields of medicine and science are devoted to the study of it. One          (deal) with physical disorders of the brain. Another studies human behavior and mental processes.
     These fields of study have           (exist) in some form since ancient times so you'd think that by now we'd know all about the brain. Nothing could be further from the           (true). After thousands of years of           (study) it, there are still many           (area) about the brain that remain unknown. And because the brain is so complicated, we tend to            (simple) information about how it works in order to make it more understandable.