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.

Q: After what seemed an age, the actor sat up.

A: Singular
****
Q: As though the numerous pairs acted as one, the blades began to spin and then fly toward him.

A: Plural
****
Q: A mass of recruits had already gravitated to the Whites.

A:
Singular
****