他的辛勤工作没有得到任何认可。

His hard work remained ___unacknowledged by the company.

她的贡献虽然重要，却长期未被认可。

Her important contributions remained ___unacknowledged for years.

我的请假申请已经提交三天了，但至今还未得到回复。

My leave request has been ___unacknowledged for three days.