practicing a lot is n____ for us to learn English well对划线部分提问smoking may couse _cancer___

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practicingalotisn____forustolearnEnglishwell对划线部分提问smokingmaycouse_cancer___practicingalotisn____for

practicing a lot is n____ for us to learn English well对划线部分提问smoking may couse _cancer___
practicing a lot is n____ for us to learn English well
对划线部分提问smoking may couse _cancer___

practicing a lot is n____ for us to learn English well对划线部分提问smoking may couse _cancer___

necessary 必要的  或者填  needed 需要的

What may smoking cause?吸烟会引发什么?