Sắp xếp các từ sau

1.Solar energy/ in the world./ by many countries/ will be useda
2. because/ a non-renewable energy source/ to replace it/ Petroleum is/ it takes a long time.
3. Ho Chi Minh city/ Travelling from Hanoi to / is fast and convenient. / by airplane/
4. a volunteer/if you / You are/ without payment. / willingly and/ help other people
5. It took/ 20 minutes/ him/to/ travel to/ the airport. /