完形填空
Joe Simpson and Simon Yates were the first people to climb the West Face of the Siula Grande in the Andes mountains. They reached the top 1，but on their way back conditions were very 2. Joe fell and broke his leg. They both knew that if Simon3alone，he would probably get back 4. But Simon decided to risk his5and try to lower Joe down the mountain on a rope.
As they 6down，the weather got worse. Then another 7occurred. They couldn't see or hear each other and，8，Simon lowered his friend over the edge of a precipice（峭壁）. It was9 for Joe to climb back or for Simon to pull him up. Joe's 10 was pulling Simon slowly towards the precipice.11，after more than an hour in the dark and the icy cold，Simon had to 12. In tears，he cut the rope. Joe 13 into a huge crevasse（裂缝） in the ice below. He had no food or water and he was in terrible pain. He couldn't walk，but he 14to get out of the crevasse and started to 15 towards their camp，nearly ten kilometers 16.
Simon had 17the camp at the foot of the mountain. He thought that Joe must be 18，but he didn't want to leave 19. Three days later，in the middle of the night，he heard Joe's voice. He couldn't 20 it. Joe was there，a few meters from their tent，still alive.
