Optimism and pessimism are powerful forces, and each of us must choose which we want, so as to shape our outlook and our expectations. From which p 1 do we want to view life? Will we look up in hope or down in d 2 ? An optimistic attitude is not a luxury; it's a n 3 . The way you look at life will determine how you feel, p 4 , and how well you will get along with others. C 5 , negative thoughts, attitudes, and expectations feed on themselves; they become a self-fulfilling p 6 . Pessimism creates a sad and hopeless place w 7 no one wants to live. When the world is seen a 8 a hopeful, positive place, people are more likely to a 9 , Optimism doesn't need to be naive. You can be an optimist and still r 10 that problems exist and that some of them are not d 11 with easily. Yet optimism makes difference in the a 12 of the problems solver! Optimism draws our attention away from negativism and c 13 it into posiyive, constructive thinking. When you are an optimist, you are more c 14 with problem-solving than with useless fault-finding. To tackle a big problem, one needs both optimism and persistence. 请在答案中填写完整单词