填空题 As soon as he finished, his supporters applauded 1, but most of the masses were taken aback and exchanged doubtful glances.(vigor)
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【正确答案】 1、正确答案：vigorously applaud    
【答案解析】解析：后应为vigor的副词形式，“applaud vigorously”意为“起劲的鼓掌”。