用所给词的正确形式填空

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

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

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

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

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

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

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

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

小题9:I have five 　　　　　(knife).

汽轮机调节系统中传动放大机构的输入是调速器送来的（）、（）或（）信号。