Peter's job was to examine cars when they crossed the frontier (边界) to make sure that they were not smuggling (走私) anything into the country. Every evening he would see a factory worker coming __36__ the hill towards the frontier, __37__ a bike with grass on it. When the bike __38__ the frontier, Peter would stop the man and __39__ him take the grass off. Then he would examine the straw very __40__ to see whether he could find anything, after which he would look in all the man's pockets __41__ he let him tie (捆绑) the grass again. The man would then put it on his bike and go off down the hill with it. Although Peter was always __42 __ to find gold or other valuable things hidden in the straw, he never found __43__. He was sure the man was smuggling something, but he was not __44__ to think out what it could be.
Then one evening, after he had looked __45__ the grass and emptied the worker's pockets __46__ usual, he __47__ to him, "Listen, I know you are smuggling things __48__ this frontier. Won't you tell me what it is? I'm an old man, and today's my last day on the job. Tomorrow I'm going to retire (退休). I promise I shall not tell __49__ if you tell me what you've been smuggling." The worker did not say anything for __50__. Then he smiled, turned to Peter and said quietly, "Bikes."

Peter's job was to examine cars when they crossed the frontier (边界) to make sure that they were not smuggling (走私) anything into the country. Every evening he would see a factory worker coming __36__ the hill towards the frontier, __37__ a bike with grass on it. When the bike __38__ the frontier, Peter would stop the man and __39__ him take the grass off. Then he would examine the straw very __40__ to see whether he could find anything, after which he would look in all the man's pockets __41__ he let him tie (捆绑) the grass again. The man would then put it on his bike and go off down the hill with it. Although Peter was always __42 __ to find gold or other valuable things hidden in the straw, he never found __43__. He was sure the man was smuggling something, but he was not __44__ to think out what it could be.

Then one evening, after he had looked __45__ the grass and emptied the worker's pockets __46__ usual, he __47__ to him, "Listen, I know you are smuggling things __48__ this frontier. Won't you tell me what it is? I'm an old man, and today's my last day on the job. Tomorrow I'm going to retire (退休). I promise I shall not tell __49__ if you tell me what you've been smuggling." The worker did not say anything for __50__. Then he smiled, turned to Peter and said quietly, "Bikes."