2. 

Astronaut lives on the space station.

3.

Astronauts travel 

between the space station and Earth 

by space shuttle.

1.

The astronauts sleep in sleeping bags.

2.

Because of the weightlessness,

the sleeping bags will float

if they aren’t tied to the wall.

3.

This guy is doing somersualts.

1.

Yes, he is.

He is making space walks 

outside the sation.

2.

The station’s crew members 

build space station,

have space walk,

do experiment and so on.

3.

I think it takes ________ 

to build space staion.