1.so修饰形容词/副词
such修饰名词
such+a/an+形+名,so+形+a/an+名
例如:such a good book,so good a book
2.I used to (A )early,but now i am used to( B )late
理由:used to do sth:过去常做某事
be used to doing sth:习惯于做某事
3.C
4.My life _A_changed a lot (My life 看做一个整体,所以要用三单)
5.happened in china