山里的回声让我们的呼喊听起来更响亮。

Our shouts sounded louder as the mountains ___echoed them back.

山洞里传来我们喊话的回声。

The ___echo of our voices bounced back from the cave walls.

孩子们喜欢模仿老师的话，好像在玩回声游戏。

The children love to ___echo their teacher's words, as if playing an echo game.