他从街对面友好地挥了挥手。

He gave a friendly ___wave from across the street.

他手一挥表示散会。

With a dismissive ___wave of his hand, he signaled the meeting was over.

我们告别时，她在病床上微微颤抖地挥了挥手。

She managed a slight, tremulous ___wave from her hospital bed as we said our goodbyes.