3 Complete the sentences with words from the box.
cures energy satellites source technology theory
The sun is the most important source of light for our planet.
At the moment, most of our energy comes from oil.
We will need to find cures for new diseases.
Godel's theory of time travel says that we will need to travel faster than the speed of light.
American military technology is becoming more and more advanced.
Satellites in space carry many different kinds of equipment.