_________, the forest fire would have been discovered much earlier.

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had been fighting; before have been fighting; when had fought; until fought; as

ascribed approached confirmed confined

put off put on put out put up

reduced lessened decreased restricted

how fires start damage caused by fire the fascination of fire fighting forest fires

how fires start damage caused by fire the fascination of fire fighting forest fires

with regard to on guard on guard against in regard to

behind a forest fire ahead of a forest fire on the sides of a forest fire all around a forest fire

out beyond above below

when the fire happened what caused the fire how did the fire happened why did the fire happen

how fires start damage caused by fire the fascination of fire fighting forest fires

how fires start damage caused by fire the fascination of fire fighting forest fires

behind a forest fire ahead of a forest fire on the sides of a forest fire all around a forest fire

why which as for which

behind a forest fire ahead of a forest fire on the sides of a forest fire all around a forest fire

on fire； put out on fire； went out caught fire； went out caught fire； put out

behind a forest fire ahead of a forest fire on the sides of a forest fire all around a forest fire