change the active voice "she must close the door as we feel suffocated here" in to passive form.
Whatever you do, do NOT use 'by her'!
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How would closing the door help people feel less suffocated?
You could say "The door must be closed . . . ", but I think putting the sentence into passive is a bad idea.
christalin janetplease give the exact answer.
This exercise is an abuse of the English language and should be protested in every language class.