We all know __________（污染） air does harm to our health.It’s necessary to keep our air

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• _________(污染）air does harm to our health,it's necessary to keep air fresh and clean
• We all know __________（污染） air does harm to our health.It’s necessary to keep our air
• We all know __________（污染） air does harm to our health.It’s necessary to keep our air
• _________(污染）air does harm to our health,it's necessary to keep air fresh and clean
• It is good for our health to breath fresh air语法是否正确?
• Although fast food is t_____,it does harm to our health.