parents always give their c______ red packets应该填什么?

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• parents always give their c______ red packets应该填什么?
• 1. The Chinese New Year is a very important f_______ to the Chinese. People in Shanghai usually goto the flower markets to buy f_____ and fruit trees. They also buy p_____ of good things to eat and d_____. On the first day of that festival, parents always give their c______ red packets. There’s some m______ in them.
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• 1、（x+y）^2 2、（x+2y）^2 3、（-2x+3）^2 4、（-xy^2z^3）^2