根据句意和首字母提示，写出各句中所缺单词的正确形式。
1. —It is so clean!
—We s________ the floor just half an hour ago.
2. The boy h________ eating rice day after day.
3. Some t________ like surfing the Internet very much.
4. Karen b________ a storybook from one of her friends.
5. Good s________ should not have too much fat or sugar.
