1. A. serious　　　　　 B. wonderful　　　　 C. necessary　　　　　 D. thankful

15. A。他们生产并销售圆珠笔供空军使用，故选sold。

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The generation gap(代沟)has become a 　1　 　problem. I read a 　2　 　about it in the newspaper. Some children have killed themselves after quarrels(争吵)with 　3　 . I think this is because they don't often have a talk with each other. Parents now 　4　 　more time in the office, 　5　 　they don't have much time to 　6　 　with their children. As time passes, they 　7　 　feel that they don't have the 　8　 　topics(话题)to talk 　9　 . I want to tell parents to be more with your 　10　 , get to know them and 　11　 　them. And for children, show your 　12　 　to your parents. They are the people who 　13　 　you. So 　14　 　them your thoughts(想法). In this way, you 　15　 　have a better understanding of each other.

14. A。句意理解和实际判断想结合。

13. C。指当时空军正需要这样的笔。

12. B。the time of 表示“……的时候”。

11. D。他们喜欢他的设想。

10.D。Why not +动词原形。

9. C。由于他发现用钢笔写有麻烦，所以他和朋友开始做实验，想更好的方法。

8. A。用副词well修饰动词write。

7. B。往笔里装墨水可用fill the pen with ink。这里省略了with ink.。