太阳落山后，那艘船慢慢消失在视线中。

After sunset, the ship slowly ___disappeared from view.

这种古老的方言正在逐渐消失。

This ancient dialect is slowly ___disappearing.

我的钱包在拥挤的地铁里不见了。

My wallet ___disappeared in the crowded subway.

她早上突然消失了，连张字条都没留。

She ___disappeared in the morning without leaving a note.