First, the person must recognize that there is a problem.For example, Sam’s bicycle is broken.Sam must __4__ that there is a problem with his bicycle.Next the person must __5__ the problem.Before Sam can repair

　　his bicycle, he must know why it does not work.He must __6__ the parts that are wrong.

　　Now the person must look for __7__ that will make the problem clearer and lead to possible solutions.Suppose Sam __8__ that his bike does not work because there is something wrong with the brakes.__9__， he can look in his bicycle repair book and read about brakes or talk to his friends at the bike shop.

　　After __10__ the problem, the person should have several suggestions for a possible solution, which might be: tighten or loosen the brakes; buy new brakes and change the old ones.

　　In the end, one __11__ seems to be the solution to the problem.Sometimes the final idea comes quite __12__ because the thinker suddenly sees something in a __13__ way.Sam suddenly sees there is a piece of chewing gum stuck to a brake.He immediately hits on the solution to his problem: he must __14__ the brake.Finally the solution is __15__. Sam does it and finds his bicycle works perfectly.In short he has solved the problem.

　　()1.A.practice

　　B．thinking

　　C．understanding

　　D．help

　　()2.A.fail

　　B．work C．change

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