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.

Once he got inside, he found a cavern that opened into a room about twenty feet long and ten feet wide.
Singular

They would surely leave marks.
Plural

Leslie grabbed a nearby menu and scanned its contents.

Singular