从下列单词中选择适当的词填空，每个词只能用一次。 

exchange expand raise    on  save  hopes  

company reasons wealthy by   buy  owe   

Many people buy shares of stock on the stock market. Some are very51They have much more money than they really need for everyday expenses. They buy shares of stock in52of getting more money. Other people are not very rich, but they53stock shares anyway. They buy shares to try to become rich. Or they may buy them as part of a plan to54money. There are many other55why people buy and sell stock shares. In general, everyone who buys or sells stock shares hopes to make money. 

Why does a56want to share its money with other people? There are several reasons. First, the company may be doing very well. It may need money to57. By selling shares of stock, the company can get the money it needs. Sometimes, a company may58a lot of money to banks. By selling shares of stock, it may be able to pay the banks. However, the reasons why companies sell their stocks on the stock59are often complex. In general, all companies that sell shares of stock on the stock exchange need to60money for one reason or another.