【推荐1】What’s the p________ of China?

【推荐2】The________ (人口) of China is the largest in the world.

【推荐3】The _________ (人口) of China may not increase as fast as it used to be because of the high cost of living and open thoughts of the young.

【推荐1】The p________ of China is much bigger than that of the USA.

【推荐2】The ________（人口）of the world is increasing quickly.

【推荐3】—What’s the p________ (人口) of the city?
—Sorry! I’m new here.

【推荐1】These people are all great ________ (科学家).

【推荐2】We could see the ________ (happy) on his face after he heard the bad news.

【推荐3】根据句意和汉语注释，写出单词的正确形式。
1. Simon is more __________(create)than all the other students in his class.
2. As a doctor, you can never have a moment of__________(careless).
3. Though the house is too expensive, it is__________(certain) very comfortable.
4. Mrs Wu led the children into the __________(warm) and safety of the house.