At least thirty times Bobby had tried to climb the snowy mountain, but he had never 1 the top. His friend old Peeper, who knew a lot about his failures, 2 Bobby to try again. He gave Bobby a pair of 3 and said, “If it starts clouding over, put on the glasses, or if your feet start hurting, put them on too. The glasses are very 4 . They’ll help you.” Bobby 5 the gift without much thought. The day came when he was to have another 6 . About two hours after he started, he felt his feet hurting. Then he 7 what Peeper had said, and put on the glasses. The pain was pretty bad, but 8 the sunglasses he could clearly see the snow-covered mountain top, so he went on. 9 , clouds were gathering. But this time Bobby could still see the 10 through the clouds. He kept 11 , leaving the clouds behind, forgetting his pain, and finally arriving at the top. It was certainly worth it. His feeling of 12 was extremely good, almost as great as that 13 view. The mountain below was surrounded by a sea of clouds. He couldn’t believe that the clouds were as 14 as that, so he looked more closely at the sunglasses, and discovered the 15 . Peeper had engraved( 镌刻 ) the snow-covered mountain top on the sunglasses, 16 Bobby could see it when he was looking upwards! Bobb 17 that the only obstacle( 障碍 ) to reaching the top had been losing 18 when he couldn’t see the mountain top. He was thankful that Peeper had used that little 19 to help him see that his 20 was never impossible, and that it was still there, where it had always been.