关于第三个问题，还是有点疑问：即我每次回美国有时大约只待了10天左右，是否有嫌疑只是回来保持连续有效居民期，从而在申请公民的时候被刁难？
-No problem, but you have to provide the evidences for your staying in US physically.
在递交申请之前，是否必须在美国原来所在州连续呆（physically）3个月以上？
-Depends. If most of the time you are staying in China during the year adn then, you return to US to apply for the US citizenship, you may need to stay 3 months and then, to do that. But if you just visit China for one or two months and return to US, then you may just submit the applciation immediately.
递交申请之后是否可以回国等通知，再来半下一步？
-Yes, but you may need to go forth and back frequently in a short period of time for the exam, fingerprinting, interview, etc.
现在大约需要多少时间？
另外，我有个14岁的女儿，和我同时取得绿卡并回国，后来她没有能够每半年回来一次（但每年回来一次）。如果我带她一起申请，因为她的居住时间已经置零了，是否有问题？
-No problem. Minor child (<18) does not this requirement.
