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: The chef has been preparing it all evening and it's quite extraordinary.

SOLUTION: Singular

PROBLEM: Her adrenaline was spiking again, rushing through her veins like an awakened river.

SOLUTION: Singular

PROBLEM: Especially arrogant, pompous mages who didn't possess the sense to defer to their betters.

SOLUTION:
Plural