24、We ______ in this modern school for many years, but we have never regretted our final decision to go to the western part of China to help the poor children there．

A．worked                  B．was working          C．have worked          D．had worked

23、If you want to get help from others, you should try to get your idea ______．

A．clearly                   B．crossed                  C．a(chǎn)cross                   D．understand

22、______ through the desert, they came out into the Salt Lake Valley, ______ looked beautiful．

A．Pass; which           B．Passed; that            C．To pass; in which   D．Passing; which

21、---Your job ______ open for your return ．

--- Thanks．

A．will be kept            B．will keep                C．had kept                D．had been kept

20、--- How are you managing to do your work with an assistant?

--- Well, I ______ somehow ．

A．get along         B．come on                 C．watch out              D．set off

19、In May l999, the Backstreet Boys, sold l, l33, 505 copies of their latest album in its first week in release, _________ it the most albums sold in a week, ever since Sound-Scan began recording sales figures．

A．to make                 B．making                   C．that makes             D．made

18、What’s really needed, according to most researchers in this field, ________ a "killer" application particularly suited for the way DNA computing solves problems．

A．being                     B．a(chǎn)re                         C．is                          D．was

17、--- What time do we have to be at the gate?

--- __________ passengers are already boarding．

A．Hurriedly         B．Soon                      C．Immediately           D．Since

16、Microsoft's next major operating system, Windows Vista, looks ________from today's Windows．

A．different                 B．differently              C．difference              D．differences

15、The flowers _________ sweet in the botanical garden attract the visitors to the beauty of nature．

A．smell                      B．smelling                  C．smelt                      D．to be smelt