Em cần gấp ạ, mng chỉ được điền 1 từ vào chỗ trống thôi ạ. Hứa cho CTLHN (7) _____________ most people are aware of the dangers of radiation, not many consider that they might be at risk in their own homes from radon, a naturally occurring radioactive gas. (8) _____________ it is colorless and odourless, home owners may not be aware of potential problems. However, radon is (9) _____________ dangerous that in the USA alone it is the second most common cause of lung cancer. (10) _____________ there are no immediate symptoms of exposure, which may take years to surface, it's as well to have your house tested if you are in a risk area.

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