请教几条大学英语翻译题（短语翻译）

Question

中译英
1． （回想起来）, I wish I hadn’t said those words to hurt her.
2． The boss gave him a car as a reward for his achievements，（这是他应得的）.
3．（亿万富翁只有在美国才可以）carry on like plain folks and get away with it.
4． Jack sounds very knowledgeable about computer science，(他一定受过专门训练).
谢谢解答！感激不尽！

Answer 1

只有逗号？> o <
1. Now thinking back, I wish I hadn’t said those words to hurt her.
2． The boss gave him a car as a reward for his achievements, which should be well paid off.

3．Only billionaires in America could carry on like plain folks and get away with it.

4． Jack sounds very knowledgeable about computer science, and therefore he must have receibed professional training. 这句话连接得比较奇怪-，-