Mr. Blake __________my letter, otherwise he would have replied by now.
| A．will not have received | B．needn’t have received |
| C．shouldn’t have received | D．couldn’t have received |
Over time the memory of the computer ________so much that it never forgets anything it has been told .
| A．develops | B．is developing | C．developed | D．has developed |
The mayor of Beijing said that all construction work for the Beijing Olympics _______by the year 2006 .
| A．was completed | B．had been completed | C．has been completed | D．is completed |
She worked _______a clerk in a government department after graduating from college .
| A．for | B．as | C．on | D．at |
The city was destroyed by an earthquake and it ________nearly five years before everything came back to normal .
| A．cost | B．spend | C．took | D．used |
Tom ,will you please _______my suitcase while I go to get my ticket ?
| A．take over | B．turn over | C．watch over | D．run over |