用所给词的正确形式填空。

1. Sometimes they have _____ (agree) and decide not to talk to each other.

2. By _____ (regard) problems as challenges, they will become happier.

3. Think of something _____ (bad), you will find your problems are not so terrible.

4. She decided _____ (solve) the problem by _____ (talk) with her mother.

5. It's _____ (fair) for us to lose the chance.

（14分）下图为实验室制取纯净、干燥的Cl₂，并进行检验Cl₂性质实验的装置。其中E瓶中放有干燥红色布条；F中为铜网，F右端出气管口附近放有脱脂棉。

试回答：

（1）A中所放试剂为               ，B中所放试剂为               ，二者反应的化学方程式为                               ，

（2）为得到干燥纯净的氯气，一般在C瓶中加入         试剂，D瓶中加入         试剂。

（3）E瓶中现象为             ； F中反应的化学方程式为                。

（4）H中应加入的试剂为                  ，其作用是                         。

其化学方程式为                                                  。