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C. After D. Because 22. ______ John failed to climb to the top of the mountain several times, he didn’ t give up. A. Whether B. Although C. Because D. Unless 23. It is known to all that ______ you exercise regularly, you won’ t stay in good health. A. until B. unless C. as 24. Joan says she won’ t buy a car _____ she passes the driving test. A. since B. if C. unless D. because 25. I enjoy learning English ______ it makes me a lot of time. A. because B. for C. unless D. although 26. They will try their best in the Dragon Boat Racing _____ they may fail. A. although B. until C. unless D. if 27. You will spend too much time on the way _____ you find a better route. A. if B. as C. when D. unless 28. Nothing can be done ______ our captain gives an order and we have to wait right now. A. because B. after C. as D. unless 29. Why didn’ t you try your best to get on the subway? I tried to, but it started moving ______ I could get on it. A. since B. after C. before D. if 30. Susan will not arrive at the airport on time ______ she hurries up. A. when B. if C. once D. unless 31. Jane, please turn off