阅读理解。 Many years ago, in a small town, there lived a doctor. He was good and kind. At any time of the day and night, he was always ready to go and help a sick person. Everyone in the town liked him and people always went to him when there was anything wrong with them. But the years went past, and the doctor became old. He began to lose his memory. When people noticed this, they did not go to him any more. 'He may give us the wrong medicine, ' they said. And they were afraid. The good old doctor noticed that people did not come to him any more but he did not understand why. So he asked, 'Why does no one come to me now?' No one wanted to tell him the real reason because   they did not want to make the good old man unhappy, so they said, 'You have helped all the sick people in the town.   There is no one sick now.  ' The doctor was pleased when he heard that and they went away happily. 1．People always went to the doctor when ________. A．they were wrong B．they were not right C．they were not well D．they were not happy 2．'He began to lose his memory, ' means' ________ '. A．He couldn't know his sick persons any longer B．He forgot everything in the past C．He couldn't find anything D．He couldn't remember things well 3．The sick people did not come to the doctor any more because ________. A．there was no sick man in the town B．he was old and no longer a doctor C．they were afraid of him D．he might give them the wrong medicine 4．People ________ tell the doctor why they did not go to him any more. A．didn't want to B．wanted to C．had to D．didn't need to 5．The doctor ________ when he heard that there was no one sick in the town. A．was disappointed B．was sorry C．was satisfied D．was surprised