71. Well， if you leave your name and number， I‘ll tell him to call you back when he is free.那么，您留下您的姓名和电话号码，我会告诉他让他有空时给您回电话。

　　72. I‘ll get in touch with him and call you back later.我会与他联系，过一会儿给您回电话。

　　71.He is not available now.她现在不在。

　　72. Please tell me how to format¹ a floppy² disk. I use Windows 98.请告诉我如何把磁盘格式化。我使用的是视窗98操作系统。

　　73.If you install more memory， you can use it fairly well.如果增加内存的话，你的电脑就还可以用。

　　74.E-mail seems to have reformed the organization of companies.电子邮件似乎已经改变了公司的组织形式。

　　75.Since opened our homepage one week ago， our access number has grown to over one thousand.自一星期前我们有了自己的网页以来，上去浏览的人数已经超过1000人了。

　　76. The most remarkable³ difference of the Internet from TV and video is that it is “interactive”， that is， it allows two-way communication.

        互联网和电视、录影带最明显的不同在于它是“互动的”，也就是说它允许双向沟通。

　　77. The number of people who quit their jobs and begin SOHOs should increase more and more.为了从事SOHO而辞去在公司的工作的人数应该会越来越多。

　　78. We have pleasure insending you our catalogue， which gives full information about our various products.所寄我方目录，提供了各类产品的详细情况。

　　79. We have large quantity of …。 in stock.我方可大量供应……现货。

　　80.Payment is to be made against sight draft drawn⁴ under a confirmed， irrevocable， divisible and transferable L/C without recourse for the full amount.

        付款方式为保兑的、不可撤销的、可分割的、可转让的、无权追索的全部金额即期信用证支付。