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21. What ______ public is concerned about is whether medical workers and scientists will be able to find out___ cure for this new disease in a short time.
A.²»Ìî;²»Ìî B.²»Ìî;the C. the;²»Ìî D. the; a
22._____ good, these cookies sell well.
A. Smelled B. Smelling C. Being smelled D. To smell