他的眼神中充满了疑问。

His eyes are full of ___questions.

这个符号是一个问号。

This symbol is a ___question mark.

他在会议上提出了一个重要问题。

He raised an important ___question during the meeting.

如何平衡工作和生活是一个常见的问题。

How to balance work and life is a common ___question.

她质疑这项决定的公平性。

She ___questioned the fairness of this decision.