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The second one. Cody and Aleena are the antecedents and <em>their</em> is the pronoun referring back to them.
Answer: There are several ways in which the book and the radio broadcast are different. The book is set in 1898, and told in the past tense. The radio broadcast, on the other hand, is set in 1938, and told in the present tense. Moreover, the broadcast is told as news, as if the events were being reported as they were happening.
Answer:
1. Painters and it's plural
2. Wants it's singular
3. I think it does match
