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: Again, congratulations passed back and forth until a happy silence fell back on the room.

Answer: Plural


Question: Doors littered the floor, shattered glass cracked and splintered beneath their feet.

Answer: Plural


Question: The feather was running up and down my spine.

Answer:
Singular