While ________ to foreigners，you must try your best to make yourself ________.
| A．spoken…understood | B．spoken…understand |
| C．speaking…understood | D．speaking…understand |
After being discovered by Dutch explorers in 1606，the eastern half of Australiaby the British in 1770．
| A．was claimed | B．claimed | C．was claiming | D．has been claimed |
Women prefer to buy food which has already been preparedit reaches the market．
| A．after | B．for | C．before | D．until |
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 |
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 |
Polar bears liveon sea ice，which they use as a platform for hunting seals
| A．most | B．almost | C．nearly | D．mostly |