我打电话给酒店前台询问是否有空房。

I called the hotel to make an ___enquiry about room availability.

委员会将对这起事故展开正式调查。

The committee will conduct an official ___enquiry into the accident.

客户发来邮件询问产品的价格和规格。

The client sent an ___enquiry about the product's price and specifications.