72. If you had (听从了我的劝告，你就不会陷入麻烦）

答案：followed my advice, you would not be in trouble now.

73. With tears on her face, the lady (看着他受伤的儿子被送进手术室）

答案：watched her injured son sent into the operation room.

74. After the terrorist attack, tourists (被劝告暂时不要去该国旅游）

答案：were advised not to travel to that country at the moment

75. I prefer to communicate with my customers (通过写电子邮件而不是打电话）

答案：via E-mail instead of telephone

76. (直到截止日他才寄出）his application form.

答案：Until the deadline came, he didn't send out