阅读下面短文，从短文后所给各题的四个选项(A. B, C和D)中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
It was a cold, wet day when 14-year-old Wasana Sanjeewa reached St. Anthony's College. Waiting __31__ his classroom for his classmates to arrive, Wasana looked at the __32__. Then he noticed enormous amounts of rainwater flowing down the hill behind the classroom. For a few minutes, Wasana _33__ the water, wondering why it looked so __34__．
Then it hit him — the scene was similar to the slides he was shown during Disaster Management classes.
__35__ an approaching disaster, Wasana swung into action. “Run, run, don't stay here! The rocks on the hill are going to fall on us！” he __36__ and all the students ran to the open area.Then Wasana ran over to __37__ Principal Nihal Gurauinghe what was happening.
After __38__ the hill, Gurauinghe knew the school was in trouble. He and some teachers __39__ to stop the waterflow, but they were too __40__： huge rocks fell down the hill with sand and mud, and the entire school was destroyed.
When Wasana __41__ home later that day, his white uniform covered in mud, he got the __42___ from his mother. He tried to explain that he had __43__ two hundred schoolmates __44__ she didn't believe him.
His mother __45__ realized he was telling the truth when she saw a TV report about the __46__. Filled with pride, she hugged Wasana and said that he was indeed a __47__．
No one was hurt in the incident because of Wasana's __48__ action and careful observation.
“Wasana's action __49__ us that sometimes we cannot wait until something happens before we take action. It __50___ be too late by then，” Gurauinghe said.
31. A. inside B. behind C. outside D. over
32. A. sun B. rain C. snow D. fog
33 A. pointed at B. decided on C. kept on D. stared at
34. A. familiar B. special C. fresh D. random
35. A. Banning B. Imagining C. Predicting D. Hearing
36. A. explained B. shouted C. concluded D. whispered
37. A. ask B. promise C. tell D. persuade
38. A. inspecting B. describing C. measuring D. assessing
39. A. chose B. tried C. helped D. agreed
40. A. late B. mild C. blank D. anxious
41. A. missed B. left C. moved D. returned
42. A. reward B. blame C. effect D. faith
43. A. cured B. fought C. saved D. guided
44. A. so B. or C. for D. but
45. A. naturally B. necessarily C. completely D. finally
46. A. adventure B. disaster C. failure D. experience
47. A. loser B. fool C. hero D. star
48. A. quiet B. tough C. quick D. safe
49. A. taught B. interested C. warned D. confused
50. A. might B. has to C. must D. ought to