单词拼写。

1. Collecting stamps is one of my __________ (爱好).

2. It's not __________ (礼貌的) to talk with your mouth full.

3. I think the telephone was __________(发明) in 1876.

4. China is getting richer and stronger in the new __________ (世纪).

 5. We'll be able to finish the project _________ (容易的).

请回答下列有关人体生命活动调节的问题：

人和动物生命活动调节的基本形式是（）和（），其中（）的作用处于主导地位。CO₂对人呼吸频率的调节属于（）调节。