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第十八篇： Error Correction Today we take for granted that the mail will be delivered --71-- daily at our door. But many years ago it might have been placed in a tree trunk and underneath a rock. In the early --72-- days of the mail no one could be sure about where or when it will arrive. --73-- At the southern tip of Africa there was once a post office --74-- under a rock. At the old days the route from England to India was around the Cape of Good Hope. The journey was stormy and danger. It took six long months. Sailors often --75-- wished to send mail home, but they seldom met ships bound back to England. So at the cape the sailors would go on ashore. They headed for a certain large stone. On the --76-- stone scratched the words Look hereunder for letters. --77-- They would leave their letters there, knowing that the next homeward ship would stop and pick it up. --78-- There was another post office like this at the southern tip of South America. During the golden rush days, boats --79-- sailed around Cape Horn to California. At Cape Horn was | 
