19. A. without B. with C. to D. beyond
18. A. as long as B. as far as C. as well as D. as soon as
17. A. present B. day C. past D. night
16. A. down B. up C. in D. out
15. A. cleaner B. clearer C. harder D. lower
14. A. cloud B. sky C. earth D. sea
13. A. playing B. learning C. talking D. speaking
12. A. while B. before C. after D. if
11. A. same B. similar C. familiar D. various
10. A. less B. quicker C. lower D. more