57.众所周知，贸易和专门化相辅相成，使我们每个人能使用更多的产品。

36. Dr. Aiken cut the background from the photos for the purpose of______.

31. Many businesses started up by college students have ______ thanks to the comfortable climate for business creation.

（ ）52. Bella enjoys eating out but can’t afford to spend very much at the moment as she is saving for a holiday. She has never learnt how to cook, so now might be quite a good time to find out!

63.我们真希望你昨晚没那么多工作要做,因为我们都知道你肯定会在晚会.上玩得很开心。

22. Not until the motorbike looked almost new ______ repairing and cleaning it.

35. Learning a language is about_____,so in order to grasp a language,it‘s wise to study on a daily basis.

40. The main purpose of the passage is to ______.

59.在加工过程中，会重新人为加入某些食物的维生素和矿物质，但却未必和原来的一样健康。

21. ______ the course very difficult, she decided to move to a lower level.

23. If we ______ adequate preparations, the conference wouldn’t have been so successful. 

（ ）15. People who have a large order can be given a special discount.