Điền dạng đúng cho câu

1.      My cold is  today than it was yesterday, (good)

2.      This exercise is (easy)                   of all.

3.      This flower is (beautiful)                   than that one.

4.      He has twice as (many)                  books as his sister.

5.      Which is the (dangerous)                  animal in the world?

6.      English is not so (difficult)                  as Chinese.