inquiry|enquiry

我查询了航班时刻表。

I made an ___inquiry about the flight schedule.

我对新政策有一个询问。

I have an ___enquiry about the new policy.

她对日程提出了询问。

She made an ___enquiry regarding the schedule.

医院正在对事故进行调查。

The hospital is holding an ___enquiry into the accident.