If you can't answer the question, leave a blank.

如果回答不了问题，就空着它。

《牛津词典》

They leave a blank space so that they can insert their dialogue while listening to the recording.

他们会留出空白，以便在听录音时插入谈话内容。

youdao

Leave a blank place, willing to wait.

留一片空白的地方，甘愿去等待。

youdao

Leave column E blank on all but the 4 days a year that the ETF does not go ex-dividend.

FORBES: Six Simple Steps to Protecting Your Portfolio With Put Options

The thought of starting an organization with a blank sheet of paper was intriguing, says Alemany, though her decision to leave wasn't without regret.

FORBES: Weathering The Economic Storm