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.

The email, as it was open and apparently unfinished, could have easily been a clue as to the whereabouts of General White and his family.
Singular

My publisher almost went nuts, because he wanted to promote it.
Singular

There were still old supplies lying around, so Sara took the advantage.

Plural