By careful observation and precise calculation, Nicolaus Copernicus _____ that there is no one center in the universe and the sun is the center of the solar system.
for the terrible accident, as the public thought, the major felt nervous and at a loss what to do.
Which do you enjoy your spare time, playing cards at home or taking a walk in the park?
The party was successful, but we thought it a pity not you.
Sunday, rather than at home, I preferred .
With a lot of problems , the VS troops are having a hard time in Iraq.