The climax of "The Monkey's Paw" by W. W. Jacobs occurs when Mr. White makes the secong wish, he wishs to bring his son back from the dead. This is the most suspenseful moment of the story because they hear a knock on the door afterwards, announcing that it is Herbert.
The store gave out samples by the dozen. - Is the correct phrase, as an adverbial phrase is a word/ phrase that modifies the/ qualifies an adjective. So the 'dozen' modifies the sentence.
The last one is perfect as it includes all possible interpretations. Hope that helps!
