我正在询问音乐会门票的可用性。

I am ___enquiring about the availability of tickets for the concert.

她礼貌地询问了项目的延误情况。

She ___enquired politely about the delay in the project.

我们需要在签署合同前询问条款和条件。

We need to ___enquire about the terms and conditions before signing the contract.