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
--- What has made him upset recently?
--- __________ alone to face a troublesome case．
A．Left B．Being left C．Having left D．To leave
China’s word，tuhao，which caught the attention of the dictionary’s editing team，__________ be in next year’s Oxford English Dictionary．
A．must B．need C．dare D．may
--- You know Brad Pitt is already fifty．
--- You are kidding．He doesn’t look __________ ．
A．it B．this C．the one D．that
