17. You may also be astonished to find out that they deserve your courtesy.你或許很可能驚奇地發現，他們確實值得你以禮相待。

find： to discover unexpectedly or by chance

I have not yet found the key I lost three days ago . 我沒找到三天前掉的鑰匙。

find out： to discover through examination or enquiry

We must find out the truth about the matter. 我們必須找出事情的真相。

18.All skills require constant repetition to become second nature ； good manners are no exception . 一切技能都需要經常反復而后才能成為第二天性，禮貌也是如此。

If you want to acquire a skill， you have to practice it again and again. It is the same with good manners， which you won't acquire unless you practice them constantly.

second nature： something you have done so often that you do it almost without thinking. 第二天性、習性

It has become a second nature to him to turn off all the lights before leaving the office. 離開辦公室前把所有的燈都關了已成為他的習慣了。

be no exception…is included in…不看成是例外，同樣適用

All residents must obey these traffic regulations. High-ranking officials are no exception.所有居民都要遵守這些交通規則。高級官員也不例外。

All men between 18 and 35 without exception are expected to serve in the army.所有18到35歲的男人，都要服兵役，沒有例外。

19…。to concentrate on your performance in a specific area for about a week. （ …… ）就是在一個星期左右的時間內，集中改進你在某一方面的具體表現。

You can begin by guarding against one bad type of manner for about a week.

concentrate…on…把……集中在……

Don't be absent-minded. Please concentrate your attention on the experiment.別開小差。把注意力集中在實驗上。

20.Or driving a car， why not watch yourself sternly for aggressive driving… 或是改進開車的舉止，你可以嚴格監視自己是否開起車來很霸道 ……

Why not…？用來提建議

It's a fine day. Why not go to the Fragrant Hill？ 天氣很好。我們干嗎不去香山？ But why not write to Bob for help？干嗎不給鮑勃寫信請他幫幫忙？