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

SOLUTION: Plural

PROBLEM: After what seemed to be a long opening round in the beginning of a great battle, the gunmen ceased fire.

SOLUTION: Plural

PROBLEM: The marine layer was far off the coast, giving the sun the opportunity to shine and the temperature to reach the high seventies.

SOLUTION:
Singular