In China today, _______ car is becoming _____ popular means of transportation.
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.