Answer:
They had quite forgotten him.
All this time no one had remembered Ravi.
Having disappeared from the scene, he had disappeared from their minds.
Step-by-step explanation:
These are the three sentences that suggest that the children had completely forgotten about Ravi. In these sentences, we learn that the children had been playing a game, most likely "hide and seek." Ravi had hidden. However, no one had found him, and eventually they all forgot about him. It is clear that this caused Ravi great pain.