Every person leaves a footprint．That’s what I learnt when I started to work as a private investigator 10 years ago．People pay restaurant bills with their bank cards，check into hotels or travel around. In every case，they leave a trace．And because of this，I’m able to track them down even when they don’t want to be found．
The first thing I do when I want to find out where someone is staying is to go to the neighborhood where he used to live。It’s human nature to tell stories which is why neighbors will tell me all they know when I ring at their houses．Sometimes，someone even talks about his friend’s dishonesty．Then I produce a pattern of my subject’s life：if he likes to  have a holiday in Spain or in Italy, if he prefers two-or-three-star hotels and where he might hide his assets．When I’ve got this life pattern，I start my research．
Nine times out of 10，I find the people I'm looking for．I once investigated a lorry supplier who owed￡500，000 to a subcontractor(分包商)。The subcontractor wanted to find out if it was worth bringing charges against the supplier I found out the supplier had moved assets to his son，who founded a new company offering the same product．It was all done within the law．There was no money to be got from that operation．
However, I asked the son If I could speak to his father and he told me that his parent was on a long holiday in Spain and wouldn’t be back for a while．It didn’t take me long to find out that the father wasn’t in Spain． 
I went back to the son and this time he told me that his father might be in Bulgaria, and I found him doing winter sport‘s in a beautiful mountain area．He was living in a big house on a  large piece of land he had bought for￡400，000．This was exactly the kind of asset my customer was looking for．
68．We learn from the text that a private investigator is one who           ．
A．follows people and reports on what they do
B．helps people start business
C．gives advice to people about the law   
D．settles arguments between businesses or companies 
69．The underlined word “assets”(in paragraph 2)most probably means        ．
A．houses         B．family         C．identity    D．possessions
70．According to the passage，which of the following is TRUE?
A．The author visits the place where his subject used to live in order to find out why he is dishonest．
B．It’s human nature to share some trouble with others
C．The author usually tracks someone’s bank card first if he wants to find out where the man is staying．
D．The lorry supplier moved his asset’s to his son in order to prevent paying back the money he owed．
71．We may infer from the text that the subcontractor might        
A．bring charges against the lorry supplier’s son
B．give up hope of settling the debt
C．get his money back
D．sell the big house in Bulgaria