TASK DEFINITION: In this task you are given a sentence. You must judge whether the object of the main clause is singular(like: apple) or plural(like: apartments). Label the instances as "Singular" or "Plural" based on your judgment.
PROBLEM: Once he got inside, he found a cavern that opened into a room about twenty feet long and ten feet wide.

SOLUTION: Singular

PROBLEM: He had already softened her defenses, but truly winning her affections would require a different kind of dance than he was used to.

SOLUTION: Plural

PROBLEM: The last three speakers each gave a prayer.

SOLUTION:
Singular