Time spent in a bookshop can be enjoyable. If you go to a 1shop, no assistant will come near to you and say “Can I help you? ” You 2buy anything you don’t want. You may try to 3where the book you want is. But if you can’t , the assistant will lead (引导 ) you there and then he will go away. It seems that he is4selling any books at all.
   Once a medical student found a very useful book in the shop, 5it was too expensive for him to buy. He couldn’t get it from the library, 6. So every afternoon, he went there to read7at a time. One day, however, he couldn’t find the book from its usual place and 8when he saw an assistant signing to him. To his surprise, the assistant pointed to the book in the corner, “I put 9 there so as not to be sold out,” said the assistant. Then he 10 the student to go on with his reading.