Ustedes would be the correct answer
Los amigos =the friends
Ustedes= your
Your talking about YOUR friends
Work done by fuel is chemical energy and work done by a moving object is kinetic energy.
Https://answers.yahoo.com/question/index?qid=20090509202110AAea2ww Search here. There's already some answers and examples!!
1. sacamos
2. trabajan
3. compra
4. uso
