make sure that all the doors (lock) when they leave

make sure that all the doors (are locked ) when they leave被动语态：被锁加油!不明白再问! 再问： 还有一个请你也帮一下忙 She (not realize) the importance of good manners。What a pity! 再答： didn't realize 　　一般过去时的否定式再问： 谢谢你