根据句意及首字母提示在横线处填上恰当的单词。

1.  I think the best job is the computer p _____.

2.  The boy wants to be a t _____ to introduce Chinese culture to western countries.

3.  People have different a _____ to life.  We should respect them.

4.  I found the c _____ of the discussion very interesting.

5.  People often d _____ about things that they want to do.

异构化反应中，氢气纯度低于控制指标将使催化剂的活性下降速度加快。（）