28.                  to the conference surprised us,since he was an important figure in this field after all. (invite)

他没有被邀请参加会议很让我们吃惊，毕竟他是这一行业的重要人物。

27. Advertisements have become part of our everyday life，so it is important that we educate ourselves about them                by them. ( avoid)

广告已经成为我们日常生活的一部分，所以我们要加强自我教育，以免被愚弄。

26. Back home from his holiday,the president got a pile of documents              . ( sign)

度假回来，总统有一堆文件要签名。

25. Every year one million tourists visit Stonehenge, which is believed           before the Pyramids, about 4,000 years ago. (construct)

每年大约有一百万游客参观巨石阵，据说它是在四千年以前被修建，早于埃及的金字塔。

24. The boss of the private business is so cruel that he                twelve hours a day. (have)

这家私营企业的老板真狠心，竟让他的员工一天工作十二小时。

23. To give way to the technical reform,the technician had to give up the item he had devoted himself        . (work)

为了让位于技术改革，这位技术员不得不放弃他过去几个月一直在从事的项目。

22. Not taking his failures lying down,the young scientist decided to try                       in a different way. (carry )

不甘心数次失败，这位年轻科学家决定尝试一种不同的方法去做实验。

21. When she heard her mother' s steps on the stairs，she pretended             her composition. (write)

听到妈妈上楼梯的脚步声，她假装在写作文。

20. Generally speaking，                means to get a higher position in this company. (hard)

一般来说，在这个公司，努力工作就意味着能获得一个更高的职位。

19.                  ，you will have to make a great effort to give it up. (addict)

一旦吸烟成瘾，你将不得不非常努力才能戒掉。