阅读下列短文,从短文后各题所给的A、B、C、D四个选项中,选出可以填入空白处的最佳选项。Once a man went to the doctor in his village and said, "Sir, the thoughts in my mind are always bothering(使烦恼) me. Please1 me. "
The doctor gave him the2 of another doctor and said, "Go to his house and live with him for a month. Look carefully at his lifestyle. There you will3 how to solve your problem. "
The man went to the doctor's house and told him, "The doctor in my village asked me to4 with you and learn about your lifestyle. " The doctor5 .
Days went by, and the man found there was nothing6 about the doctor's lifestyle. He talked to the doctor, but he didn't find anything to learn from their talks either. The only thing the man couldn't7 was that the doctor washed all his plates at night and he washed them again the next morning.
One day, the man asked the doctor about it.
The doctor replied, "I do this8 it's necessary to make sure the plates are not covered with dust(灰尘). Since a little bit of dust falls again on them during the night, I wash them again in the morning. 9 is your problem. Clean your mind at night and clean it again in the morning. 10 the mind will become pure(纯净的) and not bother you anymore. Regular(有规律的) cleaning of mind is very important to a happy life. "