17．Online shopping is becoming more and more common all over the world，including in China．
For many people，the main concern （顾虑） with online shopping is security （安全）．
There are several things that customers should （16）D before they buy online．You shouldn't trust a company just because it has a beautifully designed （17）B．Customers should look for other information，such as the company's full address and details of the different types of payment it accepts．Also before you buy anything，carefully （18）A the information about the goods or services for sale．
It's also very important for customers to ask for written confirmation．They should ask the company to send them an email to confirm their （19）Cand payment．Written confirmation gives the buyer further protection against （20）Dcompanies．
You should be able to send it back or change it．You may change your mind or not be
（21）Asomething you have bought online．So before you buy anything online，make sure that the shop offers a"cooling-off period"．This is a period of time when you can return an item and get your （22）Bback．All reputable （声誉好的） online shops offer this service．
When customers pay by credit card （信用卡），they have extra protection．This is a very safe way of buying goods and services online． （23）D，if you don't receive the goods you have paid for，you can make a claim against your credit card issuer．But of course，you need to make sure that your payment details are secure （24）C you pay online by credit card．
Customers should be able to check that their payment details are secure．Many companies allow their customers to send their credit card details （25）Da specia l secure page．You should only buy goods from companies that have this secure page facility．
| 16．A．work out | B．turn out | C．complain about | D．think about |
| 17．A．product | B．website | C．programme | D．system |
| 18．A．check | B．describe | C．provide | D．store |
| 19．A．message | B．introduction | C．order | D．promise |
| 20．A．organized | B．private | C．unknown | D．dishonest |
| 21．A．satisfied with | B．confident about | C．interested in | D．nervous of |
| 22．A．service | B．money | C．information | D．application |
| 23．A．In fact | B．As a result | C．By the way | D．For example |
| 24．A．after | B．till | C．before | D．as soon as |
| 25．A．over | B．past | C．below | D．through． |
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