课时作业(二十一) 必修5 unit 1 great scientists ⅰ.单项填空 1．(2014·龙岩四校联考)—would you like to join us in the game? —________，for i have something important to attend to. a．i will b．i’d love to c．i won’t d．i’m afraid not 2．(2014·沈阳六校联合诊断)as far as i know，mark is a(n)________shopper who always does some careful research on the market before he buys something valuable. a．fortunate b．generous c．enthusiastic d．cautious
