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: The slow revealing of her expanse of skin nearly caused an explosion in his gut.

Answer: Singular


Question: His concentration since Iseo left Compostela fell completely to his training.

Answer: Singular


Question: Things came tumbling out, as if the barriers she'd erected in her mind had cracked and started to spill her secrets.

Answer:
Plural