The correct choice of pronoun-antecedent agreement is "everyone" because it refers to all of the individuals in line. Using "everyone" maintains a consistent singular reference and aligns with the conventions of Standard English.

In this case, "he or she" is the appropriate pronoun-antecedent agreement because "each artist" refers to a singular form. Using "he or she" maintains a consistent singular reference and aligns with the conventions of Standard English.

In this case, "some of their" is the appropriate choice to maintain a consistent reference when referring to the doubts of multiple students. "Some of their" aligns with the conventions of Standard English.

In this case, "each member" is the appropriate choice to maintain a consistent singular reference, as "team members" refers to all individuals. "Each member" indicates the singular responsibility of each member, which follows the conventions of Standard English.

Here, the correct choice of pronoun-antecedent agreement is "either" because neither Alice nor Bob (singular references) can be sure about the attendance. "Either" maintains the consistency of singular reference while indicating that only one person can attend. This follows the conventions of Standard English.