II. 单项选择（满分15分）
21. The new secretary is supposed to report it to the manager as soon as she ____.
   A. will arrive    B. arrives    C. is arriving    D. is going to arrive

22. This is the first time that I ____ here, so I do not know much about the city.
   A. came    B. have been    C. was     D. am coming
23. We saw our teacher coming ____ our direction.
   A. in    B. to     C. on    D. towards
24. Roses need special care ____ they can live through winter.
   A. because    B. so that    C. even if    D. as