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.