根据句意及首字母提示填写单词，使句子完整。
1. K_______ are used for cutting things.
2. The table is dirty. Would you please w_______ it for me?
3. —Would you like another cake?
—No, thanks. I am f_______ .
4. You are supposed to eat soup with a s________.
5. It's not right to spit in public. It's bad m________ .
