The correct word to fill in the blank is 'set', meaning 'to put' or 'to place', and it is used here to indicate that the subject is placing the paperweight on the paper.
The sentence provided is 'He ____set ___ the paperweight on top of the paper.' Based on the context available, the sentence should be completed as 'He set the paperweight on top of the paper.'
The word 'set' means 'to put' or 'to place' something, and in this case, it indicates that the subject of the sentence is placing the paperweight on the paper, which could be done to prevent papers from being scattered by the wind or to organize them.
In literature, the action of setting something down could have various implications, indicating a character's intent, attention to detail, or interaction with their environment.