在早上是用on the morning 还是in the morning

在早上是用on the morning 还是in the morning 是ON THE MORNING OF 还是IN THE MORNING OF? 是on the morning还是in the morning 是in the morning还是on the morning? 在早上：in the morning 在寒冷的早上：in the cold morning 在一个寒冷的早上：on a 以下题用in还是on?1.( ) the morning.在早上2.( ) monday .在星期一 3.( ) the 在早上是in the morning 但是特指某一天的晚上是on the evening, 是用in the morning/afternoon 还是on the morning/afternoon 英语中是in the morning on weekends 还是on the morning on the weeke in the early morning 还是 on the early morning 是on the sunday morning还是in the sunday moring on the morning 还是at the morning 还是in the morning