—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
Over time the memory of the computer ________so much that it never forgets anything it has been told .
The mayor of Beijing said that all construction work for the Beijing Olympics _______by the year 2006 .
She worked _______a clerk in a government department after graduating from college .
The city was destroyed by an earthquake and it ________nearly five years before everything came back to normal .
Tom ,will you please _______my suitcase while I go to get my ticket ?