31C -> for
32C -> invented
33D -> the teacher
34A -> nervously
35C -> too much
36C -> colorfully
37C latest
38A included
39A entire
40B get
41D enough
42C increasing
43D majority
44A make
45B through
46B as
47. By whom taught you grammar last year?
48. One can keep promises
49. You're requested to come by seven o'clock
50. It's the first time that I have seen such a mess in my life.