He used to write with a writing brush.() He__________ __________to write with a writing brush.
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That is a bag.() ________ ________a bag.
That is my watch.() ________ ________ my watch.
These are math books.() These_________ _________math books.
无论如何定义,汽车的构造基本一致,通常由_____________、______________、_____________、______________4部分组成