小明在溢水杯中装满水（此时水面正好到溢水口），然后把木块轻轻地放入溢水杯中，有20×10^﹣6m³的水排入量筒，木块漂浮在水面上．（g=10N/kg，ρ_木块=0.5×10³kg/m³）

求：（1）木块排开水的质量；

（2）木块受到的浮力；

（3）木块的体积．

下列关系式中，哪个等式表示$y$是$x$的反比例函数（      ）

妈妈有7元2角，小明6角钱后，妈妈还剩下____。

 根据汉语提示写出单词。 
1.The good news____（传播）fast. We are very happy to hear it
2. You look ____ (苍白)， what's wrong with you?
3. Take this____(药) three times a day.
4.He coughs ____ (日日夜夜)
5.While we are in class, we should take an ____（活跃）part in all the activities.
6. Doing more exercise like running helps to____ (增强)our body.
7. All of us should ____(戒除) smoking.
8.I want go be a doctor ____ (将来)
9. Mum, don't (担心)____me. I'll take good care of myself.
10. Why don't you ____  （躺下）？

调节呼吸、心跳的重要生命中枢是（    ）