用所给词的正确形式填空
I’m very           (interest) in that             (interest) story.
You are        (suppose) to shake hands when you meet a Chinese friend.
A knife is used for         (cut) things.
The Yellow River is the second         (long) river in China.
The boy is old enough　　　　　(dress) himself.
December is the　　　　　(twelve) month in a year.
I decided　　　　　 (talk) to my parents about it .
We stayed there for a long time without 　　　　　 (say) a word.
I have five 　　　　　(knife).