根据描述选择对应的单词，写在横线上。
lion cow pig fish duck
1．It is black and white. It eats grass. We drink its milk. It's a ______.
2．It has got no hands and no legs. It can swim fast. It's a ______.
3．It has got two legs. It likes water. It can swim. It can walk, too. It's a ______.
4．It has got four legs. It eats other animals. It is brown. It's a ______.
5．It lives on a farm. It has got a big nose, a big mouth, two big ears and four legs. It eats a lot every day. It sleeps a lot, too. It's a ______.
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