她隔着街道也向他挥手回应。

She ___returned his wave from across the street.

如果他帮了你，将来回报这份善意是礼貌的。

If he offers you a favor, it's polite to ___return the kindness in the future.

他发来祝贺邮件，我迅速回复了信息表达感谢。

He sent a congratulatory email, and I quickly ___returned the message to express my thanks.