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.

A mass of recruits had already gravitated to the Whites.
Singular

Other hobbies of Amber's include : drawing, baking, arts and crafts, motorcycles, hockey and archery.
Plural

Too bad the twins hadn't.

Plural