E-commerce refers to buying and selling products through the Internet. It has been popular over the past 30 years. These days, people still have some misunderstandings about it. Here are the three most common ones. First, they think    22    sites to sell products is easy. In fact,companies have to face problems with organizing and managing all of the data needed for e-commerce sites. The second misunderstanding about doing business on-line is    23    it is cheap. To go on-line effectively, however, companies have to spend millions of dollars.A survey of 100 businesses with commerce sites    24    that most companies spent about US$750,000 just for e-commerce technology.    25    , people suppose that all companies want to sell their products on-line. It is true that some companies consider e-commerce useful,    26    they still keep their shops open to serve customers who prefer to be able to feel the actual items before buying. The answers to these three misunderstandings help explain why not all companies are doing business on-line today.
22.
(A) set up
(B) setting up
(C) be setting up
(D) that set up