问题描述：
Fill in the blanks with the given words in their proper forms.
He lives on the ____ floor.(twelve)
Lucy is the _____ girl in our class.(thin)
There is a reading-room on the _____ floor.(twenty)
_____ there a lot of traffic in the street?(be)
He lives on the ____ floor.(twelve)
Lucy is the _____ girl in our class.(thin)
There is a reading-room on the _____ floor.(twenty)
_____ there a lot of traffic in the street?(be)
问题解答：
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