完形填空（共20小题；每小题1.5分，满分30分）
阅读下面短文，掌握其大意，然后从各题所给的A、B、C、D四个选项中，选出最佳选项。
Tired and hungry, two boys walked painfully and difficultly into a big city on October 16, on their feet that had just carried them 300 kilometers.
For nine days they lived like old-fashioned travelers,   21   somewhere new to sleep every night as they walked from one place to another. The boys slept in tents and   22   a six-yuan daily plan. “I learned more in those nine days than I had in the last nine years,” said 17-year-old Li Zhao   23 . Li and 15-year-old Li Xuemeng  24  their journey on October 7, with three teachers from an Educational Motivation Research & Service Center. The purpose of the   25  was for the two troubled boys to develop a (an)   26   attitude to school and life.
With two  27  and some instant noodles for the first day, the five  28  mainly along the Highway 107. On the way to the big city,  29   of them visited schools and interviewed   30   people from different walks of life. Both were asked to write about what they  31   during the walk.
“ The two boys need to know about   32   life and learn to get rid of difficulties, so we   33  this program,” explained Du Junpeng.    34  they had tents, they didn’t just   35  anywhere at night. “We had to   36   on people’s kindness for shelter,” said Li Zhao, who admits he used to be self-centered and at first was    37  against the idea of the trip. But the challenge of getting rid of the   38  on the journey has changed him.
“I’m more   39   than before. And now I also believe failure is the mother of  40  ,” he said.
21. A. finding             B. hunting           C. searching                      D. inventing
22. A. lived on           B. worked on      C. carried out             D. went on
23. A. anxiously         B. luckily            C. excitedly                D. tiredly
24. A. developed         B. separated               C. controlled              D. started
25. A. study                      B. trip                C. task                       D. job
26. A. passive             B. popular           C. different                D. active
27. A. tents                B. lights              C. drinks                    D. tools
28. A. ran                  B. drove             C. walked                  D. marched
29. A. both                 B. none               C. either                    D. some
30. A. famous             B. brave              C. different                D. strange
31. A. covered            B. learned           C. heard                     D. recognized
32. A. interesting               B. real                C. hard                             D. meaningful
33. A. carried on         B. cared about     C. took over                      D. worked out
34. A. Although          B. If only            C. As though              D. Since
35. A. sleep                B. adventure        C. move                     D. tour
36. A. get                   B. depend           C. take                      D. turn
37. A. hardly              B. heavily           C. strongly                 D. secretly
38. A. wrongs             B. problems               C. difficulties             D. fears
39. A. sociable            B. particular               C. common                D. formal
40. A. success             B. victory           C. hope                      D. aim