问题描述：
将下列句子改成选择疑问句
1.Is Mary working?(加play改写)
________________________
2.Is Jim making cakes?(加bread改写）
________________________
3.Are they sleeping?(加talk改写)
________________________
1.Is Mary working?(加play改写)
________________________
2.Is Jim making cakes?(加bread改写）
________________________
3.Are they sleeping?(加talk改写)
________________________
问题解答：
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