阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答卷标号为16-25的相应位置上。

When China’s astronaut ZhaiZhigang carried out the spacewalk on September 27, he was wearing a spacesuit developed by Chinese scientists. Being worth more than 30 million yuan, the Feitian(飞天) spacesuit is not __16__ ordinary one.

__17__ took Chinese scientists four years to develop it. But what is special about the suit? First Let’s take a look at __18__ astronauts need to wear spacesuits.

When you visit a world with little or no atmosphere, not __19__ (wear) a spacesuit, the following things would happen:

You would become unconscious within 15 seconds because there is no oxygen.

Your blood and body fluids(液体) would “boil” and then “freeze” __20__ there is little or no air pressure.

Your would receive various types of radiation.

You could __21__ (hit) by dust or rock that moves at high speeds.

So , to protect you __22__ these dangers, a spacesuit must:

*Have a pressurized atmosphere;

*Give you oxygen;

*Keep a(n) __23__ (comfort) temperature;

*Let you see clearly and move easily.

The Feitian suit did all that and __24__ it did made it like a mini-spaceship in __25__ the astronaut stayed alive in outer space and carried out tasks.