In each of the following questions, a word has been

Solution

I. "Curiosity got the better of her, and she couldn't resist taking a quick peek inside the mysterious package." - Correct. In this statement, "peek" is appropriately used to mean a quick or brief look. II. "The child couldn't wait to peek through the keyhole and discover the surprises that awaited in the room." - Correct. Here, "peek" is used correctly to convey the idea of looking briefly or with curiosity. III. "As they reached the summit, the hikers were rewarded with breathtaking views from the peek of the mountain." - Incorrect. The correct word in this context should be "peak," not "peek." "Peak" refers to the highest point of a mountain.