instruction:
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.
question:
Those deaths marked the final dark act to seal this tomb.
answer:
Plural


question:
After what seemed an age, the actor sat up.
answer:
Singular


question:
Agents were in place, waiting for us.
answer:

Plural