我问他是否想加入，但他只是摇了摇头。

I asked if he wanted to join, but he just ___shook ___his ___head.

他站在那里，难以置信地摇着头。

He stood there, ___shaking ___his ___head in disbelief.

当你不同意时，通常会摇摇头。

When you disagree, it's common to ___shake ___your ___head.