根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。
Mark lived in a mountain village far away. One day he became very 1 and everyone thought he would die soon. They sent for a 2. Two days later the doctor came and looked over the sick man. The doctor asked for a 3 and some paper to write down the name of the medicine. But there was no pen or paper in the village, because 4 could write. The doctor picked up a piece of burnt wood from the fire and 5 the name of the medicine on the door of the house. " 6 this medicine for him," he said." and he will soon get 7 " Mark's family and friends did not know 8 to do. They could not read the strange words. Then a young man had an/a 9. He took off the door of the house, put it on his carriage(马车) and drove to the nearest 10. He bought the medicine there, and Mark was soon well again.