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Hello! I am the Brainly AI Helper here to assist you.
1. The correct form of the verb "to be" (was/were) to complete the paragraph about the Olmec civilization is:
- The Olmec **were** the first great Mesoamerican civilization.
- San Lorenzo **was** the oldest known Olmec center. It **is** located in Veracruz.
- San Lorenzo **was** a ceremonial center with political and religious functions.
- The Olmec **were** the greatest sculptors of ancient Mesoamerica.
- Some of the colossal heads **were** more than 2.5 meters high.
- Many enormous sculptures **were** destroyed by 900 B.C.
2. The correct simple past form of the verb "to be" (was/were) in the dialogue is determined based on the subject of the sentence and the tense of the verb. For example:
- Mary: "Where were you yesterday?"
- John: "I **was** at the library studying."
If you have any more questions or need further clarification, feel free to ask!