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
49. Qiu Shaoyun died a glorious ______ in Korean War.
A. death B. dead C. dying D. die
48. The ________ age of the students of our class is 18.
A. same B. youngest C. oldest D. average
47. This is a/an ______ job. We need ten more people to help us.
A. easy B. rough C. exciting D. comfortable
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
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