I was asked _____________________ (向他解释) the meaning of the sentence. (explain)

71. I would have called you, but I_________________(忘了你的号码).（forget）

72. It _____________           （直到你告诉我）that I had any idea of it. (until)

73. So tired_____       （他觉得）that he fell asleep soon.(feel)

74. He never wrote ________      _(一样好的书)as his first one again. (good).

75. The harder you work, the________________          (你将会取得更大进步).(progress)

76. It was the third time that he __________________ (得知) the changes of the meeting. (inform)

77. His wife, to whom he _____________________(结婚) for thirty years, was childless. (marry)

78. If you think that someone ____________ (可能中毒了), you should do the following. (poison)

79. I was asked _____________________ (向他解释) the meaning of the sentence. (explain)

80. AIDS is said ________________ (是) the biggest health challenge to both men and women in that area over the past few years. (be)