63. before

　　64. on

　　65. proposed

　　66. evidence

　　67. original

　　68.however

　　69. effort

　　70. opposed

　　71. once

　　72. techniques

　　73. inside

　　74. lessons

　　75. enhance

　　76. convince

　　77. trouble

　　78. diligent

　　79. process

　　80. concentrate

　　81. or