Question

the poor man's hospitality pleased the king(voice change)​

Answer 1

The king was pleased by the hospitality of the poor man.

Answer 2

$\huge\mathfrak\red{Hello\:Mate}$

$\sf{Answer:-}$ The king was pleased at the poor man's hospitability.

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We have to use 'at' preposition after 'pleased'.✓✓

$<b>$ Hope it helps!