5. Money does not always bring happiness.
金钱并不总是带来快乐。
还能这样说：
Happiness doesn't always come along with money.
Even if you get money, you are not sure to get happiness.
谚语：
Money is a good servant but a bad master.
要做金钱的主人，莫做金钱的奴隶。
6. We have to learn how to manage money.
我们必须学会理财。
还能这样说：
We have to learn money arrangement.
It is a must to learn to manage money.
应用解析：
manage about 设法处理，解决；
manage with 以……设法应付；
manage without 没有……而仍设法应付过去
7. I'm wise in money matters.
我是理财能手。
还能这样说：
I am a financial genius.
I'm good at money management.
应用解析：
a matter of opinion 看法不同的问题；
as a matter of convenience 为方便起见；
as a matter of routine 按常规；作为例行公事；
it's no matter that... ……是无关紧要的
8. She isn't good at managing money, for she always spends more money than she earns.
她不会理财，因为她总是入不敷出。
还能这样说：
She doesn't do well in money management. She can't make ends meet.
She doesn't know how to manage money, because she always lives beyond her income.
谚语：
Wisdom in the mind is better than money in the hand.
脑中有智慧胜于手中有金钱。