After lunch, without permission from parents, the two boys set off to explore the part of the beach which lay beyond the headland(陆岬). They had persuaded their young sister to 31 , saying that the long walk would be too 32 for her. Once they had got in the headland, the beach reached away endlessly before them. It was like 33 a new world. There were damp, dark caves to __34 , there were many 35 among the rocks, full of sea lives. Here and there along the beach were those 36 objects, washed up and 37 by the tide.(潮汐)
The afternoon passed 38 . The sun was already 39 when the boys reluctantly (恋恋不舍) 40 to make their 41 homewards. But long before they reached the headland, they could see that tide had come in so sudden that they were now 42 from either end of the beach. Their only chance of 43 was to find a way up the cliff(悬崖) nearby.
They soon find a narrow path 44 the cliff top. But half way up their path was 45 by a large rock which they could not climb 46 . The two boys had to 47 at the top of their voices, 48 that someone might 49 over the top of the rock. Finally came their father and two policemen. 50 of them climbed down a rope which was lowered over the rock. The boys were then pulled to safety, and thus saved from spending a terrible night on the cliff.
31.A. keep quiet B. stay home C. take a rest D. join them
32.A. tiring B. exciting C. uninteresting D. impossible
33. A. discovering B. facing C. enjoying D. imagining
34. A. look up B. explore C .hide D. search
35. A. lakes B. rivers C. waterfalls D. pools
36. A. dirty B. light C. strange D. clean
37. A. moved B. covered C. beaten D. left
38. A. quickly B. unexpectedly C. immediately D. suddenly
39. A. leaving B. dropping C. going D. setting
40. A. forgot B. decided C. succeeded D. turned
41. A. road B. way C. track D. path
42. A. cut off B. left behind C. held back D. put away
43. A. running off B. keeping clear C. getting away D. facing back.
44. A. reaching B. passing C. going up D. leading to
45. A. blocked B. covered C. stopped D. filled
46. A. on B. over C. 
round D. through
47. A. shout B. shoot C. repeat D. renew
48. A. wanting B. guessing C. believing D. hopi ng
49. A. turn B. appear C. hide D. climb
50. A. Any B. None C. One D. First
