21.Some people believe that black cats and the number 13 are ___________.
A. unfair
B. unnatural
C. unlucky
D. unhappy
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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
24. Smoking can severely ___________ your health.
A. eat
B. damage
C. comfort
D. believe
25. I also bought some ___________ clothes for the weekend.
A. considerable
B. thoughtful
C. careful
D. casual