A. concentration B. recognize C. specialist D. blackboard A. May Day B. memorable C. P.E D. freely A. mix B. have C. surround D. pay for A. per B. refer C. office D. sweep away A. abject B. courtroom C. run down the stairs D. library A. tempt B. versus C. Chinese D. mercy A. illness B. their C. look down upon D. my goodness A. classroom B. package C. smoking D. boyhood A. swimming B. neither C. conventional D. English A. art B. Pleased to meet you C. developer D. have a toothache