Nobody can tell _____ the future world will look like.

It is often said that the joy of travelling is______in arriving at your destination _____in the journey itself.

_______ impressed me was the boy’s ability to deal with this kind of difficult physics problem.

You have to wear a helmet and a life jacket for protection, just ____ you fall into the water.

My father and his teacher talked for about an hour of things and persons ______ they remembered at the school.