21. None at the Iraq police station ________ the car bombing last week .
A. survived B. was survived in C. had survived D. has survived in
22. While walking in the grass , you must ________ poisonous snakes .
A. look out B. take care of C. watch out for D. be careful for
23. SARS is dangerous _______ .
A. working at B. to work at C. to work with D. to be worked with
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