这个山洞通向哪里？

Where does this ___cave lead?

在父母的不断施压下，他最终妥协了。

Under constant pressure from his parents, he finally ___caved in.

孩子们在洞穴里发现了古老的壁画。

The kids found ancient paintings inside the ___cave.

由于暴雨，隧道顶部坍塌了。

The tunnel's roof ___caved in after the heavy rain.