下列常见的物质中，属于纯净物的是 （   ）

阅读下面的文字，按要求作文。

      请把“那天，我                       ”补充完整，写一篇作文。

      要求：①把题目补充完整；②自选文体；③不少于500字；④文中不得出现真实的姓名和校名。

选择恰当的句子补全下面的对话。

A: Hi, Jim. ____

B: I get up at 6:30. ____

A: Usually at 6:00. ____

B: I often wash my clothes and clean the windows.

A: Wow! ____

B: Do you do housework (家务活), too?

A: Yes, sometimes. ____

B: Sounds interesting!

A. You're so hard-working.

B. When do you get up on Saturdays?

C. What do you do on the weekend?

D. But I often play computer games.

E. What about you?

违约要受到​____ 。