56. B. Raising children is getting expensive.
57. C. Economic downturn.
58. A. Optimism for the future.
59. D. They don't rely on their children to support them in old age.
60. B. To advise couples to think twice before having children.
61. A) imaginations is the mother of inventions.
62. C) It sounded very much like a dream.
63. A) It may not bring about immediate economic gains.
64. D) Supportive.
65. B) They can be solved sooner or later with human ingenuity.