Answer: The sentence that uses the correct punctuation is: "Looking through the window, I saw my dog dash down the street; he had escaped the night before." In this sentence, the correct use of punctuation is demonstrated by the following: - A comma (,) is used after "Looking through the window" to separate the introductory phrase from the main clause. - A semicolon (;) is used to separate the two independent clauses, "I saw my dog dash down the street" and "he had escaped the night before." This allows for a clearer separation of ideas compared to using a comma or a period. The other options have incorrect punctuation usage: - The second option, "Looking through the window; I saw my dog dash down the street; he had escaped the night before," uses semicolons in a repetitive manner, which is not appropriate for separating the clauses in this context. - The third option, "Looking through the window, I saw my dog dash down the street; he had escaped the night before," uses a comma correctly, but then uses a semicolon instead of a period to separate the clauses. - The fourth option, "Looking through the window, I saw my dog dash down the street, he had escaped the night before," uses a comma instead of a semicolon to separate the two independent clauses, which creates a run-on sentence. - The fifth option, "Looking through the window I saw my dog dash down the street, he had escaped the night before," does not include any punctuation between the clauses, resulting in a run-on sentence as well. Therefore, the correct punctuation in this context is a comma followed by a semicolon as demonstrated in the first sentence.