Which object pronoun can replace the underlined phrase in the sentence: 'Tom bought a present for __________.'?

Which object pronoun can replace the underlined phrase in the sentence: 'Can you please pass the book to __________?'?

Which object pronoun can replace the underlined phrase in the sentence: 'Please give the keys to __________.'?

Which object pronoun can replace the underlined phrase in the sentence: 'Sarah gave a present to __________.'?

Which object pronoun can replace the underlined phrase in the sentence: 'John helped __________ with their homework.'?

Which object pronoun can replace the underlined phrase in the sentence: 'We saw Sarah and __________ at the movie theater.'?

Which object pronoun can replace the underlined phrase in the sentence: 'The teacher gave __________ homework.'?

Which object pronoun can replace the underlined phrase in the sentence: 'He asked __________ for help with his project.'?