Question

What had once happened to Tommy's teacher ?
From chapter - The fun they had.

Answer 1

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Once, Tommy's teacher was taken away for nearly a month because its history sector had blanked out completely.

Answer 2

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Tommy's teacher developed some snag and its History section was blanked out. So it was taken away for a month for repair. There a human teacher used to give same lesson to all boys and girls of same age group.