Question

complete the sentence with the pronoun that agrees with the word or words in bold.
rock pigeons are commonly found nesting on window ledges and buildings today, but
______ were first introduced to the americas by early european settlers.
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not feeling ready yet? these can help:
identify pronouns and their antecedents
replace the noun with a personal pronoun

Explanation:

The bolded noun phrase "Rock pigeons" is plural, so we need a third-person plural subject pronoun to agree with it. The pronoun "they" functions as a plural subject pronoun that refers back to the plural antecedent "Rock pigeons".

Answer:

they