Let's learn to use the problem we are facing ______ a stepping-stone to future success．
| A．to | B．for | C．as | D． by |
The loss has not yet been _______accurately ,but it is believed to be well beyond a hundred million dollars .
| A．calculated | B．considered | C．completed | D．controlled |
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 |