All 7 Uses

inquiry
in
The Invisible Man, by Wells
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And I'm very naturally anxious to get on with my inquiries.†
Chpt 2 *

inquiries = questions or investigations
Instead of "seeing 'bout it," however, Hall on his return was severely rated by his wife on the length of time he had spent in Sidderbridge, and his mild inquiries were answered snappishly and in a manner not to the point.†
Chpt 2
"He don't want no help, he says," he said in answer to his wife's inquiry.†
Chpt 3

inquiry = questioning or investigating
"All right," said the intruder, as it seemed in a low voice curiously different from the huskiness of its first inquiry.†
Chpt 11
I was apathetic, and I tried in vain to recover the enthusiasm of my first inquiries, the passion of discovery that had enabled me to compass even the downfall of my father's grey hairs.†
Chpt 20

inquiries = questions or investigations
It was my landlord with threats and inquiries, an old Polish Jew in a long grey coat and greasy slippers.†
Chpt 20
Then there would be an inquiry, the sacking of my room.†
Chpt 20

inquiry = questioning or investigating

Definitions:

(1) (inquiry)
a question or investigation -- especially one meant to gather information or find out the truth
(2) (meaning too rare to warrant focus)