问题描述：
将括号内的单词更换一个字母,组成一个新词,填在横线上,使句意完整.{cat} Who__drive the car?{now}My p
encil - box is old. Yours i s ____.
{cat} Who__drive the car?{now}My pencil - box is old. Yours is ____.
encil - box is old. Yours i s ____.
{cat} Who__drive the car?{now}My pencil - box is old. Yours is ____.
问题解答：
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