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The sentence that uses parallel structure is option A) “We searched for the lost keys in the yard, inside the toy box, and in my purse.” since it uses the same grammar structure when listing things. In this case, the grammar pattern followed is a prepositional phrase that modifies the verb “searched”. The prepositional phrases are “in the yard”, “inside the toy box” and “in my purse” since all of them start with a preposition.
In the rest of the sentences there is a break in the pattern when listing the items so no parallelism is possible. In option D) for example, there is a mix of grammar structures since it starts with prepositional phrase “in the yard”, followed by a noun phrase “the toy box”, and finishes with verb phrase “looked in my purse”.
The anwsers are:
there is another behind it just as important and just as nervously anxious to do something effective
and
this particular wave was the final outburst of the ocean
