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]: A mass of recruits had already gravitated to the Whites.
[A]: Singular


[Q]: Two pairs of filthy, crazed eyes faced me.
[A]: Plural


[Q]: Prolonged whispers echo in the crypt like those of the wind finding its way through a dense forest.
[A]:
Plural