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).
小题1:interested interesting
小题2:supposed
小题3:cutting
小题4:longest
小题5:to dress
小题6:twelfth
小题7:to talk
小题8:saying
小题9:knives
小题1:be interested in表示某人对某事感兴趣，interesting表示有趣的，修饰事物，故本句空格处填interested interesting。
小题2:be supposed to do表示理应做某事的含义，故本句空格处填supposed。
小题3:介词for后跟切的动名词形式cutting。
小题4:本句的含义为黄河是中国第二长河，故本句空格处填长的最高级longest。
小题5:enough to do sth表示足以做某事的含义，故本句空格处填to dress。
小题6:本题的含义为12月份是一年的第十二个月，故本句空格处填12的序数词twelfth。
小题7:decide to do sth表示决定做某事的含义，故本句空格处填to talk。
小题8:介词后without后跟说的动名词形式saying。
小题9:本句的含义为我有五把小刀，故本句空格处填小刀的复数形式knives。