问题描述：
The first day of a week is_.There are_days in a
The first day of a week is_.
There are_days in a week.
The last day of a week is_.
The middllle day of a week is_.
Today is Monday,tomorrow is_.
The first day of a week is_.
There are_days in a week.
The last day of a week is_.
The middllle day of a week is_.
Today is Monday,tomorrow is_.
问题解答：
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