New words：

manner ['mænər] n.方式；举止；方法；礼貌；态度
good manners 有礼貌
bad manners 没礼貌
serious manner 严肃的态度

Sample Sentences：

It is bad manners to talk with your mouth full.
A person with good manners is always kind and polite.
I don't like to talk with him; he has a very rude manner.
We must try to learn a foreign language in a serious manner.

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