英语选择you should try to get a good nights' sleep_____much work you have to do

1.whatever 是形容词,表示“不管怎样的,不论什么”,这本句中修饰名词短语 much work,意思是“不管有多少工作”,另如：
Whatever book you may read,read it carefully.不论你读什么书,总要读得仔细.
I know nothing whatever about it.关于这件事我什么也不知道.
2.no matter 不能单独用作连词,必须和副词 how、when、where、why 或者代词 what、who、which一起使用才能引导让步状语从句.如果把这个句子改为 no matter how much you have to do 也是成立的.