阅读短文，根据短文内容填空。
Little Justin was born in the river. It is spring . He is small and black . He looks around. He can not find his mum .
Justin :Mum , where are you ?
Soon he has a round head and a long tail . He meets a fish in the river . She also has a round head and a long tail .
Justin :Mum ?
Fish :No . I'm not your mum . Your mum has four legs . She's green and she has no tail.
Later, Little Justin has four legs . He is green . He meets a turtle .
Justin :Are you my mum ?
Turtle :No, I'm not your mum . Your mum has a big mouth . She can catch flies .
1．Little Justin
________ ________find his mum .
2．Little Justin
________born in the river .
3．Little Justin's mum
________four legs .She
________no tail .
4．Little Justin's mum
________a big mouth .
5．Little Justin's mum
________catch flies .
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