[解析]
(1)C 细节题.根据空格前的句子"It's your teachers' way of evaluating how much you understand what's going on in class."可知家庭作业的作用是老师评估你在课堂上理解知识的程度;所以此处应该继续讲家庭作业的作用.
(2)E 细节题.根据本段主题句"Be sure you understand the homework."以及空格后的句子"It's much easier to take a minute to ask the teacher during or after class than to struggle to remember later that night!"可知,要理解家庭作业;不要害怕问家庭作业里你不会的地方.
(3)G 推理题.本句所在段落的主题句是"Use any extra time in school.",即"利用你在学校任何的多余时间";可知,"你在学校做的工作越多,你晚上必须完成的越少"符合语境.
(4)D 细节题.根据空格后的句子"So take some breaks while doing your homework.Sitting for too long without stretching or relaxing will make you less productive than if you stop every so often."可知,在做作业的时候休息一下,如果坐得太久不休息,效率就会降低.因此此处应该说到,大多数人的注意力集中的时间不是很长.
(5)A 主旨题.本空是最后一段的主题句,所以是对最后一段内容的总结.本段主要讲的是把自己的家庭作业有计划的分配,制作一个时间表.所以"规划自己(的时间)"符合语境.