38. Countries want future space tools to be able to fall back into the earth’s atmosphere so that ____.

39. How do the Germans plan to deal with space junk?

31. Along with the letter was his promise ____ he would visit me this coming Christmas.

40. In which section of the newspaper would you probably read this article?

4.

25. She was the only one of the girls in our class ____ accepted as a candidate for the president of our Students’ Union.

23. The letter is from my sister, ____ is working in Beijing.

34. Don’t bother to look for my umbrella; it will ____ some day.

66. Great writers are those who not only have great thoughts but also express these thoughts in words which appeal powerfully to our minds and emotions. This charming and telling use of words is what we call literary style. Above all, the real poet is a master of words. He can convey his meaning in words which sing like music, and which by their position and association can move men to tears. We should therefore learn to choose our words carefully and use them accurately, or they will make our speech dull. 

57. 如果大家都能按照规则行事，我们的社会将会变得更加繁荣昌盛。

16. Experiments of this kind ____ in both the U.S. and Europe well before the Second World War.

35. I have come to the ____ that it would be unwise to accept his proposal.