阅读下列短文，然后按短文后的要求完成所给出的题目。

根据短文内容完成句子。

1. If you are in space, you can see ________ sunrises and sunsets in a whole day.

2. Some astronauts think ________ is the most fun thing to do during their free time.

3. Astronauts have to attach their sleeping bag to the wall, or they will ________.

4. Astronauts often ________ during their free time.

5. 将文中划线的句子翻译成汉语。