TASK DEFINITION: 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.
PROBLEM: The motorcycles in the garage were more practical and every day, but they were still some of the better models available.

SOLUTION: Plural

PROBLEM: The challenge in his voice startled her.

SOLUTION: Singular

PROBLEM: Essentially, the cart is just a gadget to filter and transfer fuel.

SOLUTION:
Singular