To provide an answer to the given task, we need to understand that the verb "run" should be conjugated in a proper form according to the context of the sentence. Since the sentence is in the present tense, the correct form of the verb "run" should be in the present simple tense, depending on the subject.
Therefore, the correct form of the verb "run" for the pronoun "they" in the present simple tense is "run."
So, the sentence should be: "Listen! They run."