Subway Line 4, ______ into use in September 2009,has made traveling in Beijing easier.A. having been put B. puttingG. being put D. put
25. The book ______forty maps, ______three of Great Britain.
24.He has ______the habit of taking notes while reading.
23. The writing brushes ____bamboo and animal’s hair.
22. In ______,people in that village were very poor.
21.I’m vey busy toady. ______,I have much work to do today .