完形填空
Can you imagine astronauts' everyday life in space? They also need to eat, 1, exercise and relax. They do the same things as us, but they do 2differently.
On Earth, we put food on a plate and water in a glass. Gravity（重力）holds the food down and keep the water in the glass.3 there is almost no gravity in space, so food can float（漂浮） away，and astronauts must eat and drink 4.
Sleeping is very different in space. Some astronauts like to float in the air, but most like to be in a 5bag. They tie（捆绑） the bag to a wall 6they won't float away at night.
Exercise is very important in space. On Earth, your legs 7 your body, but in space, astronauts float. So they do not use their legs often. This is very 8their legs, they must exercise for thirty minutes every day.
After a day's work, astronauts relax. They may listen to music, read, watch films, play games, or talk to their friends and families 9 the radio. Sometimes they just enjoy 10in the air.
