Since the end of the war, many of the priceless antiques ______ to their rightful owners．
| A．have returned | B．had returned |
| C．had been returned | D．have been returned |
——Guess what！I met an old school friend last week.
——How nice！How long____ each other？
| A．didn't you see | B．haven't you seen |
| C．hadn't you seen | D．don't you see |
It_____ years ago when the incident took place, and I nearly forget it.
| A．would have been | B．should have been |
| C．ought to have been | D．must have been |
After the earthquake, the president _____ a three-day period of mourning, the first-ever event of its kind for ordinary people.
| A．suffered | B．declared | C．confirmed | D．informed |
At the root of volunteering is____ idea that one person may have____ ability to offer services that can help other people.
| A．the, the | B．不填; an | C．an ; 不填 | D．不填，the |
It is nice to do something for someone else out of the blue and not to expect anything ______.
| A．in relief | B．in return | C．in turn | D．in need |