24. Why haven，t you taken it down? I think you                 when I asked you to. (listen)

你为什么没有做笔记？我想你当时根本没听我的要求。

23. Never in my life        such a fascinating scene. (enjoy)

我一生中从未欣赏过这么迷人的风景。

22. By the time                ，I will have finished reading  the book. (come)

到他回来时，我将读完这本书了。

21. Had it not been for the fact                 ，I wouldn't have won the first prize in the English Writing Competition. (help)

要不是我的老师帮助我，我就不会在英语作文竟赛中获得一等奖了。

20. The product produced by Apple, especially iphone 5 ，              in the US and have a good market internationally. (sell)

苹果公司生产的产品，尤其是iphone 5，在美国很畅销，在国际上也拥有良好的市场。

19. I'm afraid I can't attend your birthday party at 5 p.m. next Monday. I                to London long before that, (fly)

恐怕我不能参加你下周一下午5点钟的生日聚会了 在那之前很久我将已乘飞机飞往伦敦了。

18. They               but demands nothing in return, which moves me a tot. (hand)

他们总是帮助我却不要任何回报，这使我非常感动。

17. The subject        in the general meeting of shareholders until the workers threatened a strike. (come)

直到工人威胁要罢工，这个话题才在股东大会上提了出来。

16. Tm afraid you'd better not call me at 3 o'clock on the afternoon tomorrow. I            then. (have)

你最好不要在明天下午3点钟给我打电话。那时我在开会。

15.                the eco-travel and you will find it will help you understand the importance of nature. (part)

参加生态旅游，你会发现其将有助于你了解自然的重要性。