Read the sentence and identify the antecedent that corresponds with the bolded pronoun. In the tenth century, Venetian merchants traveling in the Orient brought the secret of glassmaking to their city.

The pronoun in this sentence is the word "their". The antecedent that corresponds to the pronoun is the noun Venetian merchants. The "Venetian merchants" is also the subject of the sentence. Pronouns are used in the sentence when we want to mention back to the subject to avoid repetition.