1) You (formal and plural) buy 4 chairs.
2) You buy a bag.
3) We buy a table.
4) I buy a case (suitcase).
5) He buys some pencils.
6) she buys a calculator.
Since the word <em>frutas </em>takes the article <em>las, </em>or the pronoun <em>las, </em>since in Spanish it is considered to be female, the correct answer here would be las as well:
Isabel y Marta las traen.
