题目内容：
根据下列材料，请回答题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 homes.
Some shoppers are 24 of department stores and supermarkets 25 the crowds, waiting in long lines, and sometimes 26 of finding anything they want to buy. They' d rather sit quietly at home in front of the TV set and 27 a friendly announcer describe a product 28 a model shows it. And they can 29 around the clock, buying something 30 by making a phone call.
Department stores and even mail-under companies are 31 to join in the success of home shopping. Large department stores are busy 32 their own TV channels(频道) to encourage TV shopping in the future. 33 can ask questions about products and place 34 , all through their TV sets.
Will shopping by television 35 take the place of shopping in stores ? Some industry managers think so. 36 many people find shopping at a 37 store a great enjoyment. And for many shoppers, it is still important to 38 or try on dresses they want to buy. That' s 39 specialists say that in the future, home shopping will 40 together with store shopping but will never entirely replace(取代) it.
A．must
B．should
C．shall
D．can
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