当我们到达野餐地点时，蛋糕已经不见了。

The cake was ___gone when we arrived at the picnic.

我到处找我的钥匙，但它们已经不见了。

I looked for my keys everywhere, but they had ___gone.

随着城市现代化，旧的传统正在慢慢消失。

The old traditions are slowly ___going as the city modernises.