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Never mix together household cleaning products. Although harmless when used properly, certain combinations of chemicals can cause dangerous or even ____________ gases. A. ELAPSED B. LETHAL C. INFERRED D. OBSESSIVE

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Lethal. This is because these chemicals when combined are extremely dangerous and could kill.
User Chuck Smith
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B. Lethal - lethal is another word for dangerous so that would make the most sense. Also look for clues in the sentence that might hint at the answer like this question does :)
User Atasoyh
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