专题限时训练(二十七) [说明文型完形填空]
(限时：30分钟)
(一)
Almost everyone around us uses a phone. Phones provide a simple and efficient means to conduct work or __1__ social arrangements from day to day.
Several times in course of a work day, you may be __2__ by phone with colleagues, students, lab assistants, secretaries or others on __3__ matters. If you want an appointment with your department head, you would __4__ call him and arrange a time with him. If you were unable to __5__ your appointment, or if you found you had to be late for it, you would phone and change the __6__. In this way, no one __7__ time waiting for someone who is not coming. If you want to buy something, you would “let your __8__ do the walking”. That is, you call __9__ to make sure the store has what you need. If it is an expensive item, you might call several stores to __10__ prices. If you want to take a train or plane, after finding out __11__ and prices, you can call to make a __12__； if you want to shop for clothes after work, you might call to ask how late the store is open __13__ you travel all the way there.
Phones are easily __14__. In streets, you can see public phones in which you __15__ coins to make a call. Phones have __16__ answering services; if you are not at home or in the office, or don't wish to be __17__， you switch on a machine, which will answer the call for you. A prerecorded __18__ will say to the caller, “I'm __19__. I'm not in at the moment. Please leave your name and number and I will call you back as __20__ as possible.” It's more efficient to leave one's name and number than to waste their time calling again and again.
