more和much修饰比较级的区别

more和much修饰比较级的区别
老师说,much用来修饰形容词的比较级,more形容多音节的形容词和副词,但是我还是有一些题目不太明白:
The new mobile phone is much ____(expensive) than that one.
Who is _____(famous),Daming or Xiaoming?
还有一道选择题：
He___wait until the rain ________.
A.won't ,will stop B.won't ,stops C.will ,stops D.will,will stop.
马上就要期中考试了,
还有,begin＋dong