one ·phrase

一次吃一个。

Eat them ___one ___at ___a ___time.

老师一次给孩子们发一颗糖果。

The teacher hands out candies to the children ___one ___at ___a ___time.

请一次一个人进入房间。

Please enter the room ___one ___at ___a ___time.