Jack contributed fifty dollars, but he wishes he could contribute______.

单项选择题The soldiers______to rescue those still alive the moment they got to the flooded village.

单项选择题By the end of the next year she______here for eight years.

单项选择题—Can the project stop the wastes flowing into the river —______Otherwise, it will be a disaster sooner or later.

单项选择题构成学习与教学过程的三种动态活动过程是（ ）。

单项选择题当问及“假如你是校长，你如何对待逃学的学生”时，中学生可根据自己的想象列出很多种做法。根据皮亚杰的思维发展阶段理论，这是因为中学生处于（ ）。