Since I knew how hard the life they lead is, I have understood ____ they need so much money.
--- Tom, why didn’t you come to the meeting yesterday? --- I _____, but my car broke down.
There is no doubt ______ man will conquer nature some day.
______ different life today is from ____ it was 20 years ago.
Paper-making began in China and from here it ________ to North Africa and Europe.
In 1860s, the Italian archaeologist Giuseppe Fiorelli was made director of the Pompeii dig.