63.我们从未怀疑你对此事件所作解释的真实性。

26. —Do you know our school at all?—No, this is the first time I ________ here.

24. We are confident that the environment ________ by our further efforts to reduce pollution.

35. Before taking a bus, they have to take a boat from _______ the lake.

36. What was special for some elementary school students in Auckland?

25. —Have you heard about the recent election?—Sure, it ________ the only thing on the news for the last three days.

27. If you ________ home without a word, your parents wouldn‘t be so worried now.

42. What should you read slowly when you read?

20. I made a promise to myself______this year, my first year in high school,would be different.

22. It was quite a long time ________ I figured out what had happened to the manager.

47. Experiences and skills: four years of ______ at Lambert Warner; 

18. Most colleges now offer first-year students a course specially ______ to help them succeed academically and personally.