阅读下面短文，在短文的空格内填入适当的词，使其内容通顺。（每空一词）
（本题共5小题；每小题2分，满分10分）
In China, more and more middle school students are getting shorter sleeping time than before. Most students sleep less than nine hours every night because 【小题1】time they have much homework to do. Some homework is given by their teachers, and some by their parents. Also, some students don't know how to savespend 【小题2】early . They are not careful enough while they do their homework, so it takes them a lot of time. Some students for 【小题3】 too much time watching TV programmes or playing puter games. They stay up(熬夜) very late. Some students have to get up 【小题4】 every morning on weekdays to get to school on time by bus or bike. It can be a long way from home to school.
Schools and parents should cut down some of the homework so that the children can enjoy more than nine hours of sleep every night _ 【小题5】 their health. As we all know, children are our country's future. They should be well cared for.
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解析：
【小题1】此题考查连词表示原因，学生睡眠时间少于9个小时的主要原因就是太多的家庭作业，故选because。
【小题2】此题考查名词，根据下文的内容提示可知学生们不知道怎样节省时间，故选time。
【小题3】此题考查固定句型结构spend some time in doing sth表示花费时间做某事，故用spend。
【小题4】此题考查副词，学生要早早起床，故用early。
【小题5】此题考查介词，表示为…故用for。