Detailed Instructions: You are given an English sentence with a blank, and you need to predict the missing word. After completing, the whole sentence should be gramatically correct and non-ambiguous.
Q: and a full soft ____ beard which he had worn ever since he was twenty in fact he had looked at twenty very much as he looked at sixty lacking a little of the grayness when he reached bright river there was no sign of any train
A:
brown