The building around the comer caught fire last night. The police are now _____the matter.
| A．geeing through | B．working out | C．looking into | D．watching over |
______everybody enjoys fresh cut flowers around his house．few people know how to keep them for as long as possible．
| A．Because | B．Since | C．While | D．If |
Scientific surveys conducted during the climbs ______that Mount Huandoy in Peru______ 6395 meters high
| A．shown；is | B．showed；was | C．shows；was | D．showed；is |
Women prefer to buy food which has already been prepared ______it reaches the market．
| A．after | B．for | C．before | D．until |
After being．discovered by Dutch explorers in 1606，the eastern half of Australia_____by the British in 1770．
| A．was claimed | B．claimed | C．was claiming | D．has been claimed |
Looking back，we have reasons to believe that ___more prosperous and stronger China will surely make new contributions to _____civilization of mankind．
| A．a；a | B．a；the | C．the；the | D．the；a |