题目内容：

阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。

John Smith and Sam Bush were experienced professional mountain-climbing players. But they would never forget the life-changing moments on the Andes mountains. They reached the top       but on their way back conditions were very       . John fell and broke his leg. They both knew that if Sam       alone, he would probably get back       . But Sam decided to risk his       and try to lower John down the mountain on a rope （绳）.

As they       down, the weather got worse. Then another      occurred. They couldn’t see or hear each other and,      , Sam lowered his friend over the edge of a precipice（峭壁）. It was       for John to climb back or for Sam to pull him up. Joe’s       was pulling Sam slowly towards the precipice.      , after more than an hour in the dark and the icy cold, Sam had to       . In tears, he cut the rope. John      into a large 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       to get out of the crevasse and started to       towards their camp, nearly ten kilometers       .

Sam had       the camp at the foot of the mountain. He thought that John must be       , but he didn’t want to leave       . Three days later, in the middle of the night, he heard John’s voice. He couldn’t       it. John was there, a few meters from their tent, still alive.

1.A. successfully      B. carefully         C. hurriedly  D. early

2.A. similar           B. difficult         C. special      D. normal

3.A. climbed           B. continued         C. worked      D. rested

4.A. unwillingly       B. regretfully       C. slowly       D. safely

5.A. life              B. time              C. health       D. fortune

6.A. lay               B. went             C. settled      D. looked

7.A. damage           B. storm             C. trouble      D. change

8.A. by chance         B. by mistake        C. by choice    D. by luck

9. A. unnecessary      B. practical       C. important    D. impossible

10.A. height           B. strength        C. weight       D. equipment

11.A. Surely           B. Patiently         C. Finally      D. Quickly

12.A. stand back       B. take a rest      C. hold on     D. make a decision

13.A. jumped           B. fell              C. escaped      D. backed

14.A. managed         B. planned           C. waited       D. hoped

15.A. run              B. move            C. skate        D. march

16.A. around           B. away            C. above        D. along

17.A. headed for       B. travelled to      C. returned to  D. left for

18.A. dead             B. hurt              C. weak         D. late

19.A. secretly         B. immediately.      C. tiredly      D. anxiously

20.A. believe          B. find              C. make        D. accept