Henry can’t attend the party _____ at Tom’s house at present because he is preparing the speech at the party _____ at Marie’s house tomorrow.
This software______ protect computers from being attacked by viruses and it took my brother a long time to ______ how to start it.
Never should we forget the war and sufferings _________ caused to the people.
_______ different life today is from_________ it was fifty years ago!
________ that they can’t be shown in the maps.
When________, the museum will be open to the pulic next year.