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 amber liquid gave a satisfying burn as it went down, and a happy warmth starting to tingle in my limbs.

SOLUTION: Singular

PROBLEM: The man-made chemical polonium leaks from the engines by tiny droplets.

SOLUTION: Singular

PROBLEM: Our factories head to China, creating even more greenhouse gases, making the earth warmer, supposedly.

SOLUTION:
Plural