Scientists had begun to debate privately whether or not Pluto is a plant, but this was the first time the concept was presented in a museum for all to see
Answer:
The correct answer would be They ate lunch in the restaurant, and then they took their dog for a walk in the park.
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Explanation:
The workers at the mill ARE planning to strike.
"<span>c. I sat between him and her during the sales conference" would be the only sentence that uses pronouns correctly, but it would be much more common to substitute "them" for "him and her". </span>
