【题目】连词成句：are, in, the, tree, birds, the, singing (.)
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【答案】The birds are singing in the tree.
【解析】
根据所给的单词，are是，in在……里，the这个，tree树，birds鸟，the这个，singing正在唱，可以组成句子，The birds are singing in the tree.鸟儿在树上唱歌。故答案为The birds are singing in the tree.