20. More and more high-rise buildings have been built in big cities (   ) space.

• A、in search of 

• B、 in place of 

• C、 for lack of

• D、for fear of

52 (   ).

19. Bob said he wouldn't go to the party as he was busy, but he went there (   ).

• A、after all

• B、 above all

• C、at all

• D、in all