Mr Obama, who appeared to take the lead in the race in most battleground states, seemed to______ an air of caution throughout the first Presidential debate
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.
He worked hard and achieved what he set out to do, but ________ what he had owned, including his health and his marriage.