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。