45. necessary ( Adj)
46. products ( N số nhiều)
47. productivity (N)
48. product (N)
49. saving ( N nối)
50. consumers ( khách hàng / N)
51. consumption (N)
52. consuming
53. effect
54. effectly ( adv), satisfying ( adj/V)
55. innovation ( N)
56. conservation (N)
57. Ultimately (adv)
58. celebration (N)
59. joyful (adj)
60. colorful (adj)