Final answer:
The correct form of the verb SER to fill in the blank is 'es'. La Sra. Rodriguez is a mathematics teacher.
Step-by-step explanation:
The correct form of the verb SER to fill in the blank is 'es'.
Therefore, the complete sentence would be: La Sra. Rodriguez es profesora de matemáticas.
This sentence states that Mrs. Rodriguez is a mathematics teacher.
Learn more about Verb SER in Spanish