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: Their footsteps rang out on the concrete floor.

SOLUTION: Plural

PROBLEM: My higher functions offer splendid regulation of my aqueous economy.

SOLUTION: Plural

PROBLEM: There was no hesitation between us then.

SOLUTION:
Singular