on my first day还是in my first day

on my first day还是in my first day in the first day of my life 还是on the first day of my life on the first day还是in the first day on the first day还是in the first day还是at the first? “在第一天”是on the first day还是in the first day on first day 对还是 on the first day 对 有没有in the first day,on the first day My brother was born _____a rainy day on还是in My first day in还是at school?到底是那个呀? _Christmas Day on还是in Monday is my favorite day bacause I play volleyball （in,on）that day?in,还是on in the day还是on the day? in rainy day还是on rainy day on open day还是in open day? on christmas day?还是 in Christmas day? in every day还是on every day on winter day 还是 in winter day On the first day 还是 on first day 如果加一个morning呢?如题