Question

   Daily life in space is so different from that on earth. For example, a "day in a space station is not like a "day" on earth. Astronauts may see 15 sunrises and sunsets in 24 hours. Astronauts also have to recycle almost everything such as air and water. Easy and simple things on earth become a problem in space. For example，at night，astronauts must attach (把.. 固定)their sleeping bags to the wall, or they will float(漂浮)around.

Astronauts work hard all day，but at the end of the day they get free time. During the free time，they often write e-mails to their families and friends on earth or watch DVDs. Some astronauts just watch the earth. They say it is the most fun thing of all.

阅读短文，完成下面句子,每空一词。

1. Astronauts may see       sunrises and sunsets in a day.

2. Astronauts have to attach their sleeping bags to the wall，or they will      

3. Astronauts work hard all day except      

4. Astronauts often write      to their families and friends on earth or      

5. Some astronauts think____________  is the most fun thing to do during their free time.

Answer 1

1.fifteen/15

2. float around

3. at the end of the day

4. e-mails;watch DVDs

5. watching the earth