instruction:
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.
question:
The caller hung up.
answer:
Singular


question:
A mass of recruits had already gravitated to the Whites.
answer:
Singular


question:
All members heard the news and started to head for the showers, while Lea started to clean the equipment.
answer:

Plural