Complete the following passage with words chosen from the table.(答案写字母即可) A. channels B. attitude C. achieve D. perform E. perspective F. conversely G. dealt with H. despair I. recognize J. concerned K. necessity L. constructive M. prophecy 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 (1) _______ do we want to view life? Will we look up in hope or down in (2) ______ _? An optimistic attitude is not a luxury; it’s a (3) ______ _. The way you look at life will determine how you feel, (4) _______, and how well you will get along with others. (5) ______, negative thoughts, attitudes, and expectations feed on themselves; they become a self-fulfilling (6) ______ _. Pessimism creates a sad and hopeless place where no one wants to live. When the world is seen as a hopeful, positive place, people are more likely to (7) _______ . Optimism doesn’t need to be . You can be an optimist and still (8) _______ that problems exist and that some of them are not (9) _______ easily. Yet optimism makes a difference in the (10) _______ of the problem solver. Optimism draws our attention away from negativism and (11) _______ it into positive, (12) _______ thinking. When you’re an optimist, you’re more (13) _______ with problem-solving than with useless fault-finding. To tackle a big problem, one needs both optimism and persistence.