小题1:Sunshine is good for the g________________ of plants.

小题2:Many drugs can be physically and m________________ dangerous.

小题3:The climb to the top of the mountain left the weak boy b________________. 

小题4:Her a________________ of mind during driving nearly caused an accident.

小题5:These stores sell all brands of 3G mobiles which v________________ from Samsung to Nokia.

小题6:The judge found her g________________ of murder and sentenced her to death.

小题7:Those who i________________ provide teenagers with drugs will be severely punished.

小题8:Students from different schools sat together e________________ ideas about how to protect the environment.  

小题9:Jack was infected with AIDS and he had only a small chance of s__________________.

小题10:The crowd p________________ at the sound of the guns and ran in all directions.

取只含碳酸氢钙的硬水a g，充分加热，发生如下反应：

Ca（HCO₃）₂CaCO₃↓+CO₂↑+H₂O，得到沉淀1.0g．回答下列问题：

（1）碳酸氢钙中钙元素与氧元素的质量比为　   　。

（2）计算此硬水中碳酸氢钙的质量是多少？

（3）将a g这样的硬水充分煮沸，理论上可得到的软水质量为　      　。