Answer: The sentences in which the underlined verb does not agree with its subject are:
1- A. Everyone in max's family (like) to do jigsaw puzzles.
2- C. Peter's favorite breakfast (are) pancakes and syrup.
3- A. There (is) volunteer jobs available at the museum.
4- B. (Is) there any seats still available.
Explanation: A verb that does not agree with its subject is a verb that has a singular form when its subject has a plural form or viceversa. In sentence 1) A., <u>the verb "like" does not agree in number with its subject "everyone", which demands a singular verb.</u> Similarly, in 2) C.<u> the verb is plural ("are") whereas the subject ("Peter's favorite breakfast") is singular. </u> Moreover, in 3) A.,<u> the singular verb "is" does not agree with the plural subject "volunteer jobs" </u>either. Finally, the verb in 4)B.<u> should have been "are" in order to agree</u> in number <u>with the plural subject "seats"</u>.