The following are some popular websites___________people can sell goods to each other.
| A．where | B．which | C．when | D．whose |
--- Did you turn off the lights before you left the computer room?
---- Oh, I forget _______ them off. I’ll go to do it.
| A．to turn | B．having been turned | C．to have turned | D．turning |
The policewoman believes that Derek gave a reasonably _______ account of what had happened to the poor family during the robbery.
| A．informal | B．potential | C．constant | D．accurate |
April 30 , 2010 witnessed the opening ceremony of the Shanghai World Expo, which has greatly China's status in the world．
| A．enlarged | B．inspired | C．promoted | D．encouraged |
. No decision about the holding of the conference until all the related factors have been
taken into consideration．
| A．will be made | B．is made | C．has been made | D．is being made |
. Dr. Frank failed many times but he finally _______ to find a successful way to solve the problem.
| A．broke off | B．broke out | C．broke down | D．broke through |