15. D。among the happiest of my life 意为“是我一生中最快乐的时候的一部分”。其他介词都不对。

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　　　 Ballpoint pens have made life easier for millions of people. At one time 　1　 　did not like their students to 　2　 　with pen. Perhaps it was because pens can leak(漏) and it is 　3　 　to spill(溢出) the ink. And it is hard to write on thin or cheap paper with them.

　 　 Ladislao Biro 　4　 　for a newspaper in Budapest. He spent all day 　5　 　his desk. Day in and day out, he corrected 　6　 　of thin, cheap paper with a pen and ink. He often had to stop to 　7　 　his pen and it did not write 　8　 　on the thin paper. He and his brother George 　9　 　some experiments. They wanted a pen that did not leak, with ink that did not spill. Why not 　10　 　a little ball at the end?

Two Englishmen, Henry Martin and Frederick Miles, like the 　11　 .It was the 　12　 　of the Second World War. The Air Force 　13　 　a non-leak, non-spill pen for the men to write with in 　14　 . Martin and Miles made and 　15　 　many thousands of Biro “writing-sticks” to the Air Force.

14. B。意为“还有空位子”。

13. B。 A和C绝不能用，因为后面有名词boys， the other表示“其他所有的男孩”，故也不能选。

12. A。此处只有用anyone，意为“谁也不认识”。

11. A。从上下文的意思看是转折关系。

10. B。由此可见作者知道校长大多要问这样的问题，也想出了一些回答方法。think of “想出”。

9. C。根据常识可知。

8. D。这里强调“让我们走进他的办公室”。

7. C。从at least可知不选A或B，但根据上下文可知也不可能选D，c 最恰如其分

6. B。five kilometers away from home 离家5公里处。这里很多学生会选far,事实上我们只能用副词away。