43.A.burden B.package C.weight D.obstacle
42.A.blown down B.broken down C.knocked down D.torn down
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。