1- Because the dragon failed the test and it didn't want to go the sun again.

2- Because he wanted to eat them , their animals and the forests.

3- The dragon flew around the earth and sang .The people liked the song. He was a hero.

4- Because the Iron Man helped them and made the dragon sang for them.

5- To eat the scrap metal.

6- Because the Iron Man and the dragon were kind to them.