The correct sentence to complete the given sentence, taking into account the usual saying of the Spanish-speaking person is: "por si las moscas."
What is "Por si las moscas"?
In Spanish, as in other languages, there are numerous sayings whose meaning does not refer directly to the words written or pronounced in it, but rather has a hidden meaning that is highly valid for the native person of that language.
In the case of the saying "por si las moscas," this refers to carrying out an action in anticipation of an eventuality, in this case, that Ana arrives and they do not have enough bread.
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