3. It's my sister's birthday on Sunday and I've ______ for her.

It's my sister's birthday on Sunday and I've bought a present for her. *Перевод: У моей сестры день рождения в воскресенье, и я купил ей подарок.* Explanation: The phrase "bought a present" logically completes the sentence, indicating that the speaker has prepared a gift for their sister's birthday.