Final answer:
The correct answer is 'vamos'.
Step-by-step explanation:
The subject of this question is Spanish.
The correct answer to fill in the blank in the sentence 'Mi amigo y yo ___ a la clase de química.' is vamos.
In this sentence, the subject 'Mi amigo y yo' is the plural form, so we use the verb 'vamos' which means 'we go' in English.
Learn more about Verb conjugation in Spanish