他在墙上画的图案巧妙地利用了砖块之间的空隙。

His wall painting cleverly utilized the ___voids between the bricks.

退休后，他心中留下了一种无法填补的空虚感。

After retirement, he felt an unfillable ___void in his heart.

由于技术性错误，法官宣布选举结果无效。

The judge ___voided the election results due to technical errors.