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.

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

A: Singular
****
Q: A swift rap on the rump with a rolled-up newspaper works for me. "

A: Singular
****
Q: In the shadows, their crimson petals were black.

A:
Plural
****