2. A. pracice　　　 B.thinking　　　　 C.understanding　　　　 D.help

1. A. serious　　　 B. usual　　　　　 C. similar　　　　　　on

20. A. zoo　　　　　　 B. mountain　　　　　 C. museum　　 D. laboratory

(　　　　　 People do not analyse every problem they meet. sometimes they try to remember a solution from the last time they had a　 1　 problem. They often accept the opinion or ideas of　 other people.Other times they begin to act without　 2　 ; they try to find a solution by trial and error,　 3　 , when all of these methods　　 4　 , the person with a problem has to start analysing. There are six　 5　 in analysing a problem.

　　　　　 6　 the person must recognise that there is a problem. For example, Sam's bicycle is broken, and he cannot ride it to class as he usually does.Sam must　 7　 that there is a problem with his bicycle.

　　　　 Next the person must　 8　 the problem. Before Sam can repair his bicycle,he must know why it does not work. For example, must　 9　 the parts that are wrong.

　　　　 Now the person must look for　 10　 that will make the problem clearer and lead to　 11　　 solutions. For example, suppose Sam　 12　　 that his bike does not work because there is something wrong with the brakes.　 13　 , he can look in his bicycle repair book and read about brakes,　 14　　 his friends at the bike shop, or look at his brakes carefully.

　　　　 After　 15　 the problem, the person should have　 16　 suggestions for a possible solution. Take Sam as an example　 17　 , his suggestions might be: tighten or loosen the brakes; buy new brakes and change the old ones.

　　　　 In the end, one　 18　 seems to be the solution　　 19　 the problem. Sometimes the　 20　　 idea comes quite　 21　 because the thinker suddenly sees something new or sees something in a　　 22　 way. Sam, for example, suddenly sees there is a piece of chewing gum(口香糖) stuck to a brake. He　 23　 hits on the solution to his problem : he must　 24　 the brake.

　　　　 Finally the solution is　 25　 . Sam does it and finds his bicycle works perfectly. In short he has solved the problem.

19. A. decision　　　　 B. situation　　　　　 C. subject　　　 D. problem

18. A. succeed in　　　 B. insist on　　　　　 C. depend on　　 D. join in

17. A. lightly　　　　 B. jokingly　　　　　　 C. seriously　　 D. properly

16. A. rightly　　　　 B. actually　　　　　　 C. normally　　 D. particularly

15. A. so　　　　　　 　B. besides　　　　　　 C. again　　　　 D. instead

14. A. imagined　　　 B. real　　　　　　　 C. special　　　 D. familiar

13. A. In the end　　　 B. Therefore　　　　　 C. After all　　　 D. However