.He must be helping the old man to water the flowers, _____?
| A．is he | B．is’t he | C．must he | D．mustn’t he |
Scarlett Johnasson developed ______ interest in acting at three and has made herself perhaps ______ finest actress of her generation.
| A．an; a | B．/; the | C．an; the | D．/; a |
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 |