The surgeon suggested that he __________ at once.
In the Great Depression, the American government couldn’t find good solutions _____ the unemployment problem.
In January, 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.
The speech by the mayor of Shanghai before the final EXPO 2010 is strongly impressed ____ my memory.
Many people coming from all over the country arrived at the same ____, a small village, to attend a live meeting.
This machine _____. It hasn’t worked for years.