问题描述：
I have written six letters to Joe since then.(改为被动句) Six letters __ __ __ to Joe since then.
I walk to school with her every day.(改为同义句) I __ to school with her __ __ every day.
I walk to school with her every day.(改为同义句) I __ to school with her __ __ every day.
问题解答：
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