(To enter) the room i recognized him at once (participle)

Entering the room, I recognized him at once. — Войдя в комнату, я сразу узнал его.

I recognized him at once, entering the room. — Я узнал его сразу, входя в комнату.

Did I recognize him at once, entering the room?

Who recognized him at once, entering the room?

When did I recognize him at once?

Whom did I recognize at once, entering the room?

I recognized him at once, entering the room, did not I?

Did I or did you recognize him at once, entering the room?

Did I recognize him or her at once, entering the room?