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.

When my tender skin has toughened enough to withstand the pressure of sheets, more visitors arrive.
Plural

A trickle of something simmered in my gut and the buzz of anxiety spread.
Singular

A little tremor of hope and excitement went through me.

Singular