Tom often____ (offer) to help me when I had problems in the past.
Little Tommy ____ (brush) his ____ (tooth) every morning.
今年4月底，南水北调工程首次将黄河水引到烟台，对我市农作物的干旱起到了缓解作用．下列有关水与植物的关系的叙述，不正确的是（ ）
