我该怎么做才能回报你的善意？

What can I do to ___repay you for your kindness?

见到你总是很高兴，如果你来剑桥拜访我们，我希望我能回报你的款待。

It's always a pleasure to see you, and I hope I'll be able to ___repay your hospitality if you ever come to visit us in Cambridge.

她希望通过在他的慈善活动中做志愿者来回报他的慷慨。

She hopes to ___repay his generosity by volunteering at his charity event.