我有三个苹果。

I have ___three apples.

我们需要三个人来玩这个游戏。

We need ___three to play this game.

我们约定下午三点在咖啡厅见面。

We agreed to meet at the café at ___three in the afternoon.

他三岁时开始学习钢琴。

He started learning piano at the age of ___three.