【正确答案】:
TRADITIONAL CHINESE FESTIVALS ARE GRADUALLY RECEDING FROM US WHILE WESTERN FESTIVALS ARE BECOMING MORE AND MORE POPULAR. 
【题目解析】:两个句子的连接,缺少连词。while表示对比。
TRADITIONAL CHINESE FESTIVALS ARE GRADUALLY RECEDING FROM US WHILE WESTERN FESTIVALS ARE BECOMING MORE AND MORE POPULAR. 
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