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.
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Question: If I worked fast enough, adrenaline put up a wall between me and my throbbing headache.

Answer: Singular


Question: Bare floors, blank walls, all painted the same shade of off-white.

Answer: Plural


Question: Marius growled and raised a closed fist at the ceiling.

Answer:
Plural