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mustn't
must
We ________ do like P1, and we ________do like P2.
mustn't
can
P1
P2
We ________ pick the peony flowers(摘牡丹花), and we ________ take care of(爱护) them.
mustn't
must
Homework：
1、Collect things we mustn't do and speak them out.
2、Make a short dialogue with the signs in pairs.