19.Our history teacher is a very _________ person and we admire him very much.
A. eatable
B. knowledgeable
C. selfish
D. unbelievable
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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
22. Peter will ___________ the management of the finance.
A. take off
B. take on
C. take up
D. take in
23. I hope the child can___________at school.
A. be about to
B. be in a fix
C. how come
D. behave himself