17. They are planning to talk to Joe _________ to the meeting.
A. priority
B. after
C. prior
D. before
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18. A new point of view about how to prevent earthquakes is _________ now.
A. taken over
B. taken off
C. taken on
D. taken away
19.Our history teacher is a very _________ person and we admire him very much.
A. eatable
B. knowledgeable
C. selfish
D. unbelievable
20. We trust her because we find her explanation_________.
A. considerable
B. thoughtful
C. careful
D. believable
21.Some people believe that black cats and the number 13 are ___________.
A. unfair
B. unnatural
C. unlucky
D. unhappy