是stau in healthy还是stay in health 是stay heal是stau in healthy还是stay in health 是stay health还是stay healthy

是stau in healthy还是stay in health 是stay heal是stau in healthy还是stay in health 是stay health还是stay healthy 英语 1st 表示的是first 还是the first?in the 1st centry英语 1st 表示的是first 还是the first?in the 1st centry还是in 1st centry? 是in the morning of July 1st还是on the morning of July 1st? keep in healthy还是health? 是healthier还是more healthy healthy是形容词还是副词 英语日期11号也要st吗是st还是th? 请问老师十月一号on October 1st 还是in October 1st?月份的前面应该用 in 那么是第二个对吗? 是He always is healthy还是He is always healthy 请问是sb interested in sth还是sb be interested in st请问是sb interested in sth还是sb be interested in sth healthy比较级是加more 还是ier? 更健康是More healthy还是Healthier 是stay health还是stay healthy? october 31st前用on还是in May 21st前用介词on还是in? health 和healthy的用法keep health 还是 keep healthy?是 stay health 还是stay healthy?哪个正确? healthy的名词和形容词各怎么用啊?它的名词是healthy还是形容词是healthy? in the 20st century对么?请问in the 20st century这个正确么?20st和20th哪个正确?还是都可以以?