【正确答案】 1、shocked    

【答案解析】[解析] Chock full o'Nuts
[定位处] 倒数第三段
[解析] 题干中的when the size of the ground coffee of Chockfull o'Nuts shrunk dramatically与该段提到的Chock full o'Nuts downsized the one-pound tin of ground coffee to 13 0unces对应，后面提到这一做法产生的影响：That shocked consumers(That指代...downsized the one-pound tin of ground coffee to 13 ounces),也就是说，顾客were shocked，故答案为shocked。
[设题分析] 时间状语从句处/举例处设题。理解shrunk dramatically是对downsized...13 ounces的概括总结以及That的指代内容有助于本题的解答。