Final answer:
The appropriate verb form to fill in the blank is cocinas.
Step-by-step explanation:
The appropriate verb form to fill in the blank is cocinas.
This is because the subject of the sentence is tú, which is the second person singular pronoun in Spanish. In Spanish, the verb form for the second person singular (informal) is -as. Therefore, the correct verb form is cocinas (you cook).
For example: Tú cocinas unas enchiladas muy buenas (You cook some very good enchiladas).
Learn more about Verb forms in Spanish