17．—Is there any better way to help my son get rid of the habit of playing computer games?
—To tell you the truth, it’s very hard. But we_______on this problem to improve the situation.

We looked for a flat place ____ we could put up our tent.

多年一贯制的课桌椅己无法适应孩子的身高和体重，为此，专家建议课桌椅也应按号码进行划分，让学生们坐上合适的课桌椅。这唯物辩证法的

27．The worker coming from the rural area spent twenty minutes painting on end of the stick red and_________white．

下面关于名著的表述，不正确的一项是(　　)