阅读下面一篇短文，按照句子结构的语法性和上下文连贯的要求，从各小题的四个选项中选出一个最佳答案，使短文连贯完整。
Do you like climbing? Have you ever _______ Aron Ralston? He is an American man_______ is interested in mountain climbing. As a climber, Aron _______ taking risks. This is one of _______ about doing sports. However, there are many times when Aron almost lost his life because of accidents. April 26, 2003 was an usual day for a climber. On that day, when he _______ by himself in the mountains, an unexpected thing happened. His arm _______ under a 360-kilo rock that fell on him. _______ he could not free his arm, he stayed there for five days. But when water ran out, he knew that he would _______ do something to save his own life. So he used his knife to _______ half his right arm. Then, with his left arm, he bandaged __________ so that he would not lose too much blood. Although he lost his arm, he still keeps on climbing. Do you want to be a climb lover like him?
21. | A．listened | B．listened to | C．heard | D．heard of |
22. | A．whose | B．whom | C．who | D．which |
23. | A．is used to | B．used to | C．is used by | D．was used to |
24. | A．exciting thing | B．exciting things | C．the exciting thing | D．the most exciting things |
25. | A．is climbing | B．was climbing | C．have climbed | D．climbs |
26. | A．caught | B．is caught | C．was caught | D．were caught |
27. | A．Because | B．Though | C．Before | D．After |
28. | A．has to | B．have to | C．can | D．must |
29. | A．cut up | B．cut away | C．cut down | D．cut off |
30.
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