考古学家发现了这些穴居人留下的壁画和工具。

Archaeologists found paintings and tools left by these ___cave dwellers.

他在派对上表现得像个原始人，直接用手抓食物吃。

He acted like a ___caveman at the party, eating food with his bare hands.

我叔叔对现代科技一窍不通，简直是个穴居人。

My uncle is such a ___caveman when it comes to modern technology.