16. is/ the/ likely/ fire?/ What/ most/ cause/ the/ of//
17. fire./ Humans/ most/ probably/ of/ are/ cause/ the/ the//
18. furthest/ the/ Sun/ planet/ Neptune./ The/ from/is//
19. The/ common/ of/ is/ earthquake./ most/ tsunami/ an/ cause//
20. holiday/ young/ go/ alone./ We/ too/ to/ on//
