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: marilla's ____ twitched understandingly she had expected missus rachel up she had known that the sight of matthew jaunting off so unaccountably would be too much for her neighbor's curiosity oh no i'm quite well although i had a bad headache yesterday she said
A:
lips