Put the words into right order

1.are\planes\way\the\travelling\of\fastest.

_______________________________________________

2.safer\than\bikes\and\trains\cars\are.

_______________________________________________

3.last\travelled\we\Australia\year\to.

_______________________________________________

4.go\why\by\bike\not?

_______________________________________________

5.are\expensive\planes\very.

_______________________________________________

6.helicopter\I\by\want\travel\to.

_______________________________________