It was the training ____ he had as a young man ____ made him such a good engineer.

It was ______ the old clock that the old man spent the whole morning at home.

It was the hurricane ______ was called Katrina ______ destroyed the city of New Orleans. 

It was because I was caught in the traffic jam ________ I came to school late this morning.

The patient looks much better . -------_____is it that has made him ____he is today ?