20．Your article must be sent by e-mail 　　　　　it can meet the deadline．

A．or else　　 B．so that　　 C．in case　　 D．for fear

19．　　　　　 is mentioned above, it won't be long before you regret what you have done．

　　 A．Which　　 B．That　　 C．As　　 D．It

18．-Sorry to keep you waiting for long．I'll make short work of this．

　　 -　　　　 ．I'm not in a hurry．

　　 A．Take it easy．　　 B．Take your time　　 C．Not at all　 D．Do as you like

17．Just in the centre of our city　　　　 with a history of 1000 years．

A．stands a tall tree　　 B．does a tall tree stand

　　 C．a tall tree is standing　 D．a tall tree stands

16．A severe drought　　　　 to hit several regions in the country in February，　　　 at least 3.7 million people short of water and endangering crop yields．

　　 A．has continued; having left　 　　B．continued; leaving

C．continued; and left　　　　　　 D．was continuing；to leave

15．You should always take into consideration the part a good way of learning will　　 in your studies．

A．give　　 B．make　　 C．play　　 D．teach

14．Being examined twice a year, whether it is a car or a bus or a truck，is the rule that every driver　　　　　 obey in this city．

A．shall　　 B．can　　 C．need　 D．might