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50. The trip was hard at first. But it was smooth ________.

  A. at the end          B. in the end                C. of the end         D. by the end

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49. Qiu Shaoyun died a glorious ______ in Korean War.

  A. death             B. dead                    C. dying            D. die

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48. The ________ age of the students of our class is 18.

  A. same             B. youngest                 C. oldest             D. average

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47. This is a/an ______ job. We need ten more people to help us.

  A. easy              B. rough                   C. exciting           D. comfortable

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46. _____ the problem of land erosion getting more serious, the government is searching for a way to deal with it.

  A. When             B. As                      C. If                  D. With

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45. It’s the protection for the trees ______ really matters, _______ how many trees are planted each year.

  A. which; or rather      B. that; rather than            C. what; other than     D. as; more than

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