他盯着空白的纸张发呆，试图克服内心的空虚感。

He stared at the ___blankness of the paper, trying to overcome the emptiness inside.

他面无表情地盯着前方，眼中一片茫然。

He stared ahead with total ___blankness in his eyes.

面对突如其来的问题，他脸上浮现出茫然的表情。

He looked at me with complete ___blankness when I asked the unexpected question.