In space, blood travels to an astronaut’s ...

• feet

• head

• legs

An astronaut’s heart can become … in space.

• stronger

• bigger

• smaller

Astronauts on the International Space Station need to speak English and …

• Russian

• German

• Spanish

There isn’t a lot of … in the space station.

• air

• water

• gravity

Astronauts have to ...

• be fit and healthy

• speak Chinese

• be tall

Astronauts have to ...

• be a doctor

• learn how to fly

• be older than 30

It’s difficult for humans to live in space because there isn’t any air to breathe and there isn’t any f___ w___ to drink.

There are extreme t___ too.

Astronauts can live inside a space station, but there isn’t any g___.

This means that their body changes. Their m___ become weaker.