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

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

28. I have heard a lot of good things about you ______ I came back from abroad.

17. He was very busy yesterday; otherwise, he _____ to the meeting.

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

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。

5.

38.The underlined word “imitate” has a similar meaning to ______.

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

61.与我成长的地方相比，这个城镇更加繁华，更加令人兴奋。

26. Being unique should be encouraged because that’s ______ makes our society a society. 

64.庆幸的是我们带了地图，要不然我们可能就迷路了。