Time spent in a bookstore can be enjoyable, if --71. you are a book-lover or merely there to buy a book a present. You may even have entered the shop just to find shelters away a sudden shower. --72. Whatever the reasons, you can soon become totally unaware of your surroundings. The desire to pick up a book with an attractive dust jacket is irresistible, even this method of selection ought --73. not to be followed, as you might end up with a rather bored book. You soon become engrossed in --74. some book or other, and usually it is only much later that you realise you have spent far much --75. time there and must dash off to keep some forgotten appointment -- without buying a book, of course.
This opportunity to escape the realities of everyday life is, I think, of a bookshop. There are not many places where it is impossible to do this. A music shop is very much --76. like a bookshop. You can wander round such places to your heart's content. If it is a good shop, no assistant will approach to you with the inevitable --77. greeting: "Can I help you, Sir?" You needn't buy anything if you don't want. In a bookshop an assistant should remain the background until you --78. have finished browsing. Then, only then, are his services necessary. Of course, you may want to find out where a particular section is, since when he --79. has led you there, the assistant should retire discreetly and look as he is --80. selling a single book.
答案:71. if -- whether 72. (away) from 73. (even) although 74. bored -- boring 75. (far) too 76. impossible -- possible 77. / 78. (remain) in 79. since -- but 80. (as) if