41.A.words B.letters C.secret D.love
40.A.gave up B.gave in C.gave away D.gave out
39.A.take care of B.get along with C.wait for D.keep in touch with
38.A.add B.expand C.do D.further
37.A.pleasant B.foolish C.upset D.happy
36.A.deeply B.affectionately C.gently D.kindly
54. B 他使用的是不破坏自然的天然材料。D项coming from与natural products的意义重复。
53. D 由下文他说的The environment and its study are very important可知,此处表示“他深信他工作的重要性”。
52. D 由上下文可知,此项工程已经开始。并非“完成、控制或停止”。