用所给词的正确形式填空

1.I’m very           (interest) in that             (interest) story.

2.You are        (suppose) to shake hands when you meet a Chinese friend.

3.A knife is used for         (cut) things.

4.The Yellow River is the second         (long) river in China.

5.The boy is old enough　　　　　(dress) himself.

6.December is the　　　　　(twelve) month in a year.

7.I decided　　　　　 (talk) to my parents about it .

8.We stayed there for a long time without 　　　　　 (say) a word.

9.I have five 　　　　　(knife).