我邀请他共进晚餐，他随后也回请我参加他的生日派对。

I invited him to dinner, and he later ___reciprocated by inviting me to his birthday party.

她对他微笑时，他立刻以同样的热情回应。

When she smiled at him, he immediately ___reciprocated with the same warmth.

锯子在木板上往复移动来切割木材。

The saw ___reciprocates back and forth to cut through the wood.