[B] doubt
[C] stop
[D] think
9. [A] invisible
[B] limited
[C] indefinite
[D] different
10. [A] upward
[B] forward
[C] afterward
[D] backward
11. [A] features
[B] influences
[C] results
[D] costs
12. [A] outside
[B] on
[C] by
[D] across
13. [A] deliver
[B] carry
[C] perform
[D] apply
14. [A] by chance
[B] in contrast
[C] as usual
[D] for instance
15. [A] if
[B] unless
[C] as
[D] lest
16. [A] moderate
[B] overcome
[C] determine
[D] reach
17. [A] at
[B] for
[C] after
[D] with
18. [A] Above all
[B] After all
[C] However
[D] Otherwise
19. [A] fundamental
[B] comprehensive