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He felt _________ when he couldn't help his friend in need.

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The ___________ was a large coral reef teeming with marine life.

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I _________ my homework just in time for dinner.

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They enjoyed the ___________ of the ancient city.

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The student received an assignment to research ___________ cultures.

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We decided to ___________ after reaching the top of the mountain.

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You _________ this song before, haven't you? It's been on the radio a lot recently.