Final answer:
Emphasizing the stem change in the preterit for the verb empezar.
Explanation:
Empezar undergoes a stem change in the preterit tense. In the preterit tense, the stem vowel e changes to i, resulting in the forms empecé, empezaste, empezó, etc. The other verbs - querer, trabajar, and cerrar - do not exhibit stem changes in the preterit tense.
Learn more about Spanish verbs and conjugation here:
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