我有点忙——我可以晚点给你回电话吗?
I'm kind of busy - can I ___call you ___back later?
如果你收到这条消息,请给我回电话,号码是5681275。
If you get this message, please ___call me ___back at 5681275.
他没接,所以我明天会再打过去。
He didn't answer, so I'll ___call ___back tomorrow.