39 healthy
40 careless
41 surprised
42 heavily
43 receiving
44 disappointedly
45valuable
46 well
47 quickly
48 polluted(tham khảo c48)
49 heavy
50 hard
51 explanation
52 unpolluted(tham khảo c52)
53Conservationists/conservation
54 destruction
55 irregularly
56 Sadly
57 pollution
58environmental
59 polluted
60 excited
61 helpful
62 natural
63environmentalists/ strictly
64 unpolluted(tham khảo c64)
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