根据下列各句句意和空白之后的汉语提示词，在答题卡指定区域的横线上写出对应单词的正确形式，每空只写一词。 66. A ________ (扣子)has come off his coat. 67. The boy spoke in a very low voice，________(承认) he had broken the glass. 68. What Tom did during the sports meet made all of us ________(失望的).
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