根据句意和汉语注释，在横线上写出单词的正确形式。
【小题1】While I was doing an experiment (实验), a glass dropped and was broken.
【小题2】The guide spent the whole afternoon explaining (解释) to those angry tourists.
【小题3】Mum felt worried about my brother’s strange behavior (举止).
【小题4】It is reported that about two thirds of the workers voted to accept (接受)the offer.
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解析：
【小题1】结合汉语及词首字母可知填实验的名词形式,故填experiment.
【小题2】考察句式spend ……doing。故填explaining。
【小题3】集合汉语及修饰词strange可知填behavior，抽象名词不可数。
【小题4】结合前文不定式符号to，及下文宾语可知填接受的动词原形accept、