Final answer:
The correct word to fill in the blank in sentence 11, to maintain subject-verb agreement with the compound subject 'Steak and eggs', is 'are'.
Step-by-step explanation:
The correct verb to complete the sentence in the passage from the question, "Steak and eggs ___ our favorite breakfast," is 'are'. The subject 'Steak and eggs' is a compound subject, which means two or more subjects are joined by a conjunction and therefore, the verb should agree with a plural subject. Hence, the plural form of the verb 'to be' is required, making 'are' the correct choice.
The word that correctly fills in the blank in sentence 11 is is. The sentence 'Steak and eggs is our favorite breakfast' indicates that the speaker and their brother enjoy eating steak and eggs as their favorite breakfast. Since 'steak and eggs' is a single item, the verb 'is' is used to show that it is their favorite breakfast.