Please ______ from smoking until the airplane is airborne.A．resistB．preventC．refrainD．rest

Until then, his family _________ from him for six

—Smoking is forbidden in the workshop, please stop it. —Sorry, I ________________.A.a

Please ______ from smoking until the aeroplane is airborne.A．refrainB．preventC．resistD．res

Please ______ from smoking until the airplane is airborne.[1997]A．refrainB．preventC．resist

Why dont you ______ smoking for a while until your cough gets better？A．lay outB．lay offC．l

Please restrain yourself from smoking and spitting in public places, since the law______th