Teacher: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.
Teacher: Now, understand the problem? Solve this instance: for in the tacit relations which maintain the bond of family union the mother to maintain her ascendancy ____ her daughter must never fail to be a model of wisdom and a type of perfection now
Student:
over