Question

Smoke fills the room.
Change into passive voice.

Answer 1

heya!!

Sentence -

Smoke fills the room.

Voice change -

The room is filled with smoke.

#hope it helps!!

Answer 2

heya!
here's your answer!

we can see in this question we have to change active voice into passive voice.

while changing his sentence from active to passive voice we always do some structural changes and some changes in the order of the sentence and so on and so forth. 

hands while changing in this sentence to we will have to do the same
is the answer that comes forward will be:-

the room is filled with smoke


as you can see we have change the order of arrangement of the sentence along with some minor structural differences.

that's your answer.:)

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Hope this helps you:)