20.Though the South still has many problems______, _____ seems to be a possibility that a new south will display its new image to the world sooner or later.

A. to deal with;　 it　　　　　 　　　　　　　 　　　　　　　　　 B. to be dealt with;　 that　

C. to deal with ;There　　　 　　　　　　　　　 　　　　　　　　　 D. do　 with;　 this

19. In his letter was his promise ____ he would spend the Spring Festival with his family.

　 　　 A. that　 　　　　　　　　　　　　　 B. what　 　　　　　　　　　　　　 C. which　　 　　　　　　　　　　 D. whether

18. The young lady，________at home，wanted to go out for traveling.

　 　 A. tired of staying　 　　　　　　　　　　　　　　　　　　　　　　　　　 B. tired with staying　 　　

C. tiring of staying　 　　　　　　　　　　　　　　　　　　　　　　　　　　　 D. being tired of staying

17. With ____ bison, grass shoots were not eaten, so grass didn’t grow ______.

　　　　 A. much more; very strongly　　 　　　　　　　　　　　　　　　 B. fewer; as strongly

　　　　 C. fewer; rather strongly　　　　 　　　　　　　　　　　　　　　　　　 D. many more; too strongly