问题描述：
选择合适的短语,并用所给词的适当形式填空,补全句子.
选择的：die of；die out.
1.Many old customs（风俗）are（）in our life.
2.Nowadays,more and more people（）all kinds of cancer（癌症）.
选择的：die of；die out.
1.Many old customs（风俗）are（）in our life.
2.Nowadays,more and more people（）all kinds of cancer（癌症）.
问题解答：
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