根据所给提示填空。

1. If you're s_____________ and you know it, sit and cry.

2. If you're h_____________ and you know it, fan your face.

3. If you're t_____________ and you know it, go to sleep.

4. If you're c_____________ and you know it, stamp your feet.

5. If you're h_____________ and you know it, turn on the fan (电扇).

简述毛 * * 关于社会主义社会基本矛盾学说的内容。