Given the task definition and input, reply with output. 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.

and that if she noticed anything odd or out of place she would never rest until she had ferreted out the whys and wherefores thereof there are plenty ____ people in avonlea and out of it who can attend closely to their neighbor's business by dint of neglecting their own

of