Nelson Mandela is，__________ the greatest man of the 20th century，certainly among the most extraordinary leaders．
A．if there B．if any C．if not D．if so
--- Look，someone has left the fridge door open again．
--- Well．It __________ me，Morn．
A．isn’t B．won’t C．hasn’t been D．wasn’t
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
