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。

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

42. It’s implied in the passage that the author may be _____. 

29. ______ is known to everybody, the moon travels round the earth once every month.

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。

33. Better take a hat with you ______ you get sun burnt because of the strong sunlight.

18. —John, What ______ in your hand?—Look! It‘s a birthday gift for my grandma.

50. Try to eat light and avoid greasy,______ and salty food because it adds toxins to the body.

47.You can get the bacteria under control by bathing with your soaps ______ for two weeks.

32. Bob thought he couldn’t go to the party because he had to write a report, but he went ______.

20. Please send us all the information ______ you have about the candidate for the position.

（ ）54.Gina is a music teacher. Although she prefers classical music, she likes to follow the kind of music that interests the teenagers she teaches.