问几道高中外语题目（回答时分析要详细的）

问几道高中外语题目（回答时分析要详细的）
1、Look at what you have done!You______more careful.
A、may be B、had to C、should have been D、would be
2、____he knows,he stiu needs to learn.
A、As much B、Though C、Muchas D、Since
3、____the day went on,the weather was getting worse.
A、With B、Since C、While D、As
4、Difficult____the task was,Lmanaged to fulfiu it on time.
A、as B、that C、however D、yet
5、What you say and do____nothing to do with me.
A、is B、are C、has D、have
6、We are all used to thinking that work provides the material things of life.
A、make it possible B、make it possible for
C、make possible D、is made possible