海伦的脸上没有流露出任何她在想什么的迹象。

Helen's face gave no ___indication of what she was thinking.

每天给她送花是他爱意的明确表示。

Bringing her flowers every day was a clear ___indication of his affection.

他的电子邮件中没有任何他打算辞职的表示。

There was no ___indication in his email that he planned to resign.