N._____2.The doctor warned about the underline(spread) of the virus on social media. N._____3.They tried to underline(perfect) the working conditions. V._____4.He didn't know the difference between underline(right) and underline(wrong). N._____

根据语境，写出下列画线词的词性和词义。 1.They regard eating as a $\underline{key}$ part of their lifestyle. N._____ 2.The doctor warned about the $\underline{spread}$ of the virus on social media. N._____ 3.They tried to $\underline{perfect}$ the working conditions. V._____ 4.He didn't know the difference between $\underline{right}$ and $\underline{wrong}$. N._____

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