用方框中所给单词的适当形式填空。

kill  little  enemy  use  step

 
【小题1】They fought against their ______ bravely.
【小题2】We should do more work with ______ money.
【小题3】They went to success step by ______.
【小题4】This is a ______ mobile phone, but it looks like a new one.
【小题5】The mother cat was ______, and the baby cat had to live by itself.