根据以下材料，回答题
Have you ever had to decide whether to go shopping or stay home and watch TV on a weekend?
Now you 21 do both at the same time.Home shopping television networks ( 网络)have become a
22 for many people to shop without 23 having to leave their home.
Some shoppers are  24 of department stores and supermarkets--fighting the crowds, waiting in
long lines, and sometimes having slight 25 of finding anything they want to buy.They'd rather sit
quietly at home in front of the TV set and watch a friendly announcer describe a product 26 a model
shows it.And they can shop around the clock, buying something 27 by making a phone call.
Department stores and even mail-order companies are 28 to join in the success of home shopping.
Large department stores are busy 29 their own TV channels (频道) to encourage TV shopping in the
future.Customers can ask questions about products and place 30 , all through their TV sets.
Will shopping by television 31 take the place of shopping in stores? Some industry managers
think so. 32 many people find shopping at a real store a great enjoyment.And for many shoppers, it is
still important to 33 or try on dresses they want to buy.That' s  34 specialists say that in the
future, home shopping will 35 together with store shopping but will never entirely replace it.
第21题的答案是(　　)