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: Flames erupted with a pop and everyone fell immediately silent.

Answer: Plural

Question: An old-school fuel gauge on the handlebars informed him that he had half a tank of petrol.

Answer: Singular

Question: A loud boom shook through the ship, shaking more frost atop them.

Answer:
Singular