写出与划线部分同类的单词，使句意通顺。
1．I have a pet. It’s a cat. Peter has a pet too. It’s a ______.
2．The lemon is so sour. The _______ is sweet.
3．Ginger likes fish. Sam likes ______.
4．The fish smells nice. It _______ nice too.
5．The pineapple is hard and ______.
6．My father likes playing football. My mother likes ______.
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