Всавь нужные слова:The planet we on is called "Earth". Earth is

Всавь нужные слова:
The planet we on is called "Earth". Earth is one of the eight planets............move around round and round the sun. Until............twentieth century, we didn't have............really good maps of our planet. But now, special cameras in space can............pictures of Earth so making maps is easy! ............of our planet has water on it so, in pictures, Earth often............like a big blue and whitr ball! But pictures of Earth don't only help us to make maps. When we look at............, we can also learn a............about the Earth's environment and weather. Travelling in space and exploring other plfnets teaches............more about earth, too. ............you like to design spaceships or to be an astronaut one day?