题目内容

My little brother showed his best manners in the summer camp. (be on one’s bestbehavior)

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If you have a difficult time, I’ll support and encourage you until the end.(see through)

Don’t throw the plastic bags away, as they may be useful sometime. (come in handy)

It is good for you to know what you don’t know. (pay)

公式(￢P∧Q)∨(￢P∧￢Q)化简为（），公式 Q→(P∨(P∧Q))可化简为（）。