Fill each gap with the most appropriate option from the list following the gap.
I had hardly _____ down to sleep when i heard the gunshot?
Answer Details
"I had hardly _____ down to sleep when I heard the gunshot?" requires the correct past participle of the verb "to lie," which means "to recline" or "to be in a horizontal position." The correct form is "lain." Therefore, the completed sentence is: "I had hardly lain down to sleep when I heard the gunshot."