17、I had great difficulty       the suitable food on the menu in that restaurant．

A．find                                           B．found

C．to find                                      D．finding

16、Lucy has a great sense of humour and always keeps her colleagues       with her stories．

A．a(chǎn)mused                                        B．a(chǎn)musing

C．to amuse                                     D．to be amused

15、       you may have, you should gather your courage to face the challenge．

A．However a serious problem          B．What a serious problem

C．However serious a problem          D．What serious a problem

14、       the city centre, we saw a stone statue of about 10 metres in height．

A．Approaching       B．Approached        C．To approach       D．To be approached

13、One reason for her preference for city life is        she can have easy access to places like shops and restaurants．

A．that           B．how           C．what            D．why

12、When changing lanes, a driver should use his turning signal to let other drivers know    

A．he is entering which lane             B．which lane he is entering

C．is he entering which lane             D．which lane is he entering

11、Wind power is an ancient source of energy        we may return in the near future．

A．on which                                       B．by which

C．to which                                       D．from which

10、         our manage objects to Tom's joining the club, we shall accept him as a member．

A．Until          B．Unless             C．If           D．After

9、That is the only way we can imagine        the overuse of water in students' bathrooms．

A．reducing         B．to reduce          C．reduced          D．reduce

8、Complete the following passage by using the words in the box．Each word can only be used once．Note that there is one word more than you need．

Forests in the northern half of the globe could be growing faster now than they were 200 years ago as a result of climate change, according to a study of trees in eastern America．The trees appear to have faster growth rates due to longer growing seasons and higher concentrations （濃度） of carbon dioxide in the 1  ．

Geoffrey Parker, a scientist at the Smithsonian Environmental Research Centre in Edgewater．Maryland, said that the increase in the rate of growth was unexpected and might be   2   to the higher temperatures and longer growing seasons documented in the region．The growth may also be influenced by the significant    3   in atmospheric CO₂,he said．

"We made a list of reasons these forests could be growing faster and then excluded half of them," Dr Parker said．Their study suggests that northern forests may become increasingly important in  4    the influence of man-made CO₂ on the climate．

    Dr Parker and his colleagues have   5   out a detailed record of the trees on a（n）   6 basis since 1987．They calculated that due to the global warming the forest is producing   7  tons of wood each year．

The scientists _ 8 _ the land with trees at different stages of growth and found that both young and old trees were showing increased growth rate．More than 90 per cent of the tree groups had grown by between two and four times faster than the scientists had   9   from estimates of the long-term rates of growth．