问题补充：
We are going to take the College Entrance Exams in about sixteen days. Therefore, many students still don’t know what to balance their study, rest and physical exercises while prepared for the Exams. They usually devote too much time to go over their lessons, what results in a poor health and low efficiency of learning.
As the proverb goes, early to bed and early to rise make a man healthy, wealthy and wise. We’d better leave us enough time to rest and sleep since it enables us to learn our lessons more efficient. What’s more, a strong and healthy body is the base for our further study, future work and creative activities.
In brief, as we are preparing for the Exams, don’t forget that rest, exercise and study were equally important.Therefore构成However
答案：
(答案→)Therefore构成However
解析：
【小题1】Therefore构成However上下文之间存在着转折关系，我们要去参加高考，然而很多学生不知道在身体上和精神上如何平衡学习和生活。
【小题2】what改为how句意分析。不知道如何平衡学习和生活。
【小题3】prepared改为preparing本句中的动词prepare与主语many students构成主动关系，故使用现在分词做状语。
【小题4】去掉for本句中动词短语prepare sth直接准备sth。
【小题5】go改为going固定搭配devote…to…；其中的to是介词，后面要接动名词的形式。
【小题6】what改为which这是一个定语从句，what不能引导定语从句，which指代先行词在句中作主语。
【小题7】make改为makes 本句考察主谓一致，早睡早起是一个很好习惯，故使用单数形式。
【小题8】us改为ourselves使用反身代词表示强调，给我们自己留下足够的时间。
【小题9】efficient改为efficiently使用副词efficiently在句中作状语，修饰动词短语learn our lessons。
【小题10】were改为are 本文的基本时态是一般现在时，故使用are。
