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1. We should make a clear _____ between the two scientific terms for the purpose of our discussion. A. distinction B. discrimination C. deviation D. separation 2. Rumors are everywhere, spreading fear, damaging reputations, and turning calm situations into ______ ones. A. tragic B. turbulent C. vulnerable D. suspicious 3. I was deeply impressed by the hostess ________ and enjoyed the dinner party very much. A.hostility B. indignation C. hospitality D. humanity 4. All imaginative _______ is a reflection of the real world. A. invention B. creation C. discovery D. illusion 5. Two discussions from different points of view may ______ each other. A. complexion B. compliment C. appendix D. complement 6. Now a paper in Science argues that organic chemicals in the rock come mostly from ______ on earth rather than on Mars. A. configuration B. constitution C. condemnation D. contamination 7. The library has a vital role in our search for knowledge. It serves as a workshop for the entire college or university, students and ______ alike. A. executives B. faculty C. crew D. staffs 8. In general, matters which lie entirely within state borders are the ______ concern of state government. | 
