题目内容：

    Do you know astronauts’ everyday life in space? They also need to eat, _________, exercise and relax. They do the same thing as us, but they do them _________.

On the earth, we put food on a plate and put _________ in a glass. Gravity (重力) holds the food down and keeps the water in the glass. There is almost no gravity in space and food can fly away, _________ astronauts must eat and drink carefully.

Sleeping is very different in space. Some astronauts like to float (漂浮) in the air, but most say _________ they like to be in a sleeping bag. They tie (系) the bag to a wall so that they won’t float away at night.

Exercise is very important in space. On the earth, your legs carry your body, _________ in space, astronauts float, so they do not use _________ legs often. This is very bad _________ their legs, so they must exercise for thirty minutes every day.

After a day’s work, astronauts can’t wait _________. They may listen to music, read, watch films, play games, or __________ a few minutes talking to their friends and family on the radio. Sometimes they only enjoy floating in the air.

1.A.study B.sleep C.work D.play

2.A.differently B.lovely C.lonely D.hardly

3.A.air B.cloud C.water D.wind

4.A.because B.but C.so D.if

5.A.when B.if C.that D.why

6.A.but B.so C.or D.because

7.A.they B.theirs C.them D.their

8.A.of B.to C.for D.with

9.A.to relax B.relaxing C.to laugh D.laughing

10.A.pay B.spend C.take D.cost