TASK DEFINITION: In this task you are given a sentence. You must judge whether subject of the main clause is singular or plural. Label the instances as "Singular" or "Plural" based on your judgment.
PROBLEM: Several passengers raise their digital cameras and cellphones to snap both Alex and myself.

SOLUTION: Plural

PROBLEM: The fights were widespread and included both high schools and colleges.

SOLUTION: Plural

PROBLEM: Giving what he hoped was a reassuring bark, Reyes backed away from the edge of the pit.

SOLUTION:
Singular