Is it polite for us to ask about a girl is age?

Is it polite for us to ask about a girl is age? it's not polite to ask someone about his or her a( ),that is it is polite to do It is polite for/of you to do,哪个对? As we all know ,it is not polite to keep others （）for a long It is not polite to ask someone to do something without sayi it is difficult for us to learn a foreign langua It is i____ for us to eat a balanced diet 英文句子翻译11. It is a good__idea____ to ask Pro. Zhou to join us It is important( ) A for us to do eye exercise B for us to d It is not polite to ask----(person) questions.横线上应填什么 It’s not polite to ask people what the weather is like in En