Ⅳ.borrow trouble.杞人忧天，自找麻烦

　　Ⅴ.a watched pot never boils.心急吃不了热豆腐

　　Ⅵ.retort insult for insult.以牙还牙

　　Ⅶ.burn dayligt.白日点灯，徒劳无益

　　Ⅷ.burn one's boats.破釜沉舟，背水布阵

　Ⅸ.burn oneself out.筋疲力尽
1.Practice makes perfect.   熟能生巧。

2.A friend indeed is known by sharing hardships. 患难是朋友的试金石。

3.Plain living and high thinking. 生活要朴素，情操要高尚。

4.What is done by night appears by day. 若要人不知，除非己莫为。

5.Zeal without knowledge is fire without light. 热情而无知，犹如无光之火。

6.You never know till you have tried. 不尝试，不知晓。

7.Nothing in the world is difficult if you set your mind to it. 世上无难事，只怕有心人。

8.Pay what you owe,and you'll know what's your own. 付清你所欠下的债，方知什么是属于自己的。