填空题 Next the thinker must define the problem. Before Sam can repair his bicycle, he must find the reason why it does not work. 1 He must make his problem more specific.

• A. However, when all these methods fail, the person with a problem has to start analyzing.
• B. Eventually one suggestion seems to be the solution to the problem.
• C. He immediately realizes the solution to his problem: he must clean the gear wheels.
• D. For instance, he must determine if the problem is with the gears, the brakes, or the flame.
• E. After studying the problem, the person should have several suggestions for a possible solution.
• F. In short, he has solved the problem.