23、The troops ____ on for three days and nights．The soldiers are in great need of rest．

A．had marched                  B．have been marching

C．marched                                      D．are marching

22、_____ having some money raises our level of happiness, having too much money does not．

A．While           B．When           C．As          D．Until

21、—Have you handed in your schoolwork yet?

—Yes, I have．I guess it _____ now．

A．has graded         B．is graded          C．is being graded          D．is grading

20、China understands the situation and needs of underdeveloped countries on the issue of climate change and urges developed countries to support them______ technology and finance．

A．in spite of        B．owing to        C．regardless of            D．in terms of

19、The project ______ by the end of 2011 will expand the city’s telephone network to cover 2000000 users．

A．being accomplished                                    B．accomplished

C．to be accomplished                                     D．having been accomplished

18、There is much chance        Bill will         from his injury in time for the race．

A．that; recover        B．which; recover        C．that; relieve          D．which; relieve

17、He is a man of few words, but he ______ be talkative sometimes．

A．shall        B．must          C．can         D．would

16、The Olympic snowboarding event,        , was exciting．

A．on which many people watched                   B．where many people watched TV

C．which many people watched on TV                     D．where many people watched on TV

15、The discovery of gold in California        a rush to get there．

A．set off           B．set up          C．set out          D．set in

14、______ difficult the task may be, we must finish it on time, because we can’t miss ______ a precious opportunity．

A．Whatever; so       B．However; such        C．However; so       D．Whatever, such