如果你现在付账，我稍后还你。

If you cover the bill now, I'll ___pay you ___back later.

我欠你午餐钱。我明天还你。

I owe you for lunch. I'll ___pay you ___back tomorrow.

她需要尽快偿还贷款。

She needs to ___pay ___back the loan as soon as possible.