Jessica's high grades in her geometry class made her mother and ____ very proud
To find the missing word, let's analyze the sentence. The clue is that Jessica's high grades in her geometry class made her mother and someone else proud. We can infer that the missing word should indicate that someone else besides her mother is proud.
One word that could fit in this context is "father." It is common to mention both parents when referring to someone's pride. Therefore, Jessica's high grades in her geometry class made her mother and father very proud.