He is rather difficult to make friends with, but his friendship, ____, is more true than any other.
| A．once gained | B．when to gain |
| C．after is gained | D．while gaining |
You fool! You __________ all the people in the car yesterday if it had not been for me．You were so drunk while driving!
| A．could kill | B．might have killed |
| C．had killed | D．should have killed |
--- Could I have a word with you，Mr. White?
--- OK．__________ you make it short．I've got a meeting in five minutes．
| A．as far as | B．if only |
| C．so long as | D．now that |
Look! There is a whole crowd of people over there．Go and see what __________ and if it is a bargain，buy it．
| A．is selling | B．has been selling |
| C．is being sold | D．has been sold |
E-Bay，Amazon and Shopbop are popular websites __________ people can sell goods to each other．
| A．where | B．which | C．when | D．whose |
--- Where is your great-grandmother __________ your mother’s side from?
--- She is from Beijing．
| A．by | B．on | C．at | D．of |